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#26 |
Account Suspended
Join Date: Apr 2009
Location: Oklahoma City
Posts: 4,709
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Re: Rod knock on an engine with 4000 miles??????
I can tell you real quick how to check the main bearings and rod bearings. If you have a garage pull the front of the truck inside the door. If not, put the passenger side as close to your house or other wall/fence as you can get it and roll the window down. Bring the engine up to a constant 3000 rpm. After a couple of seconds, let up on the accelerator only SLIGHTLY so that it doesn't drop more than a few hundred rpms. Do this several times. If it's a rod or main it will make a dinstinct clanking noise each time you do it. A loose torque converter will also do the same thing however, you said it does it under a load and a torque converter usually will not so I'd rule that out for now.
With the engine idling, you can also take a wooden handle (like a broom handle minus the broom) and put one end against the engine block and wrap your hand around the other end (flush with the end) and then lay your ear on it like listening through a wall. If you have something knocking you will hear it through the handle and this saves you having to buy anything to listen with. Not to throw a damper on anything but if your oil pressure is varying from 30lbs to 70lbs, you have a main bearing problem. It could be a gauge malfunction though so who knows. |
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#27 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Rod knock on an engine with 4000 miles??????
Do you lose pressure when you accellerate and gain pressure when you let off the gas. If yes to either of these pull the motor the lower end is trashed and crank and bearings with line bore are in your future.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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#28 |
Senior Member
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Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
not really. when it starts acting up it just drops the oil pressure down but it still acts normal
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#29 |
Senior Member
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Location: Estherville, Iowa
Posts: 3,371
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Re: Rod knock on an engine with 4000 miles??????
Why Marvel Mystery oil in a new engine ? Isn't that some pretty thin stuff ?
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#30 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: Rod knock on an engine with 4000 miles??????
last monday my engine started knocking. i pulled the steel crankshaft out in 3 pieces.
try turning flywheel/crankshaft back and forth and see if harmonic ballancer moves the same. hell i didnt even think a car could run with a broken crankshaft. a few pics of the carnage in my album. 5.3 swap in progress.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, Last edited by brad_man_72; 04-17-2009 at 01:20 PM. |
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#31 | |
Account Suspended
Join Date: Apr 2009
Location: Oklahoma City
Posts: 4,709
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Re: Rod knock on an engine with 4000 miles??????
Quote:
Last edited by highperf4x4; 04-17-2009 at 09:40 PM. |
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#32 |
Special Order
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Location: Mt Airy, MD
Posts: 85,859
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Re: Rod knock on an engine with 4000 miles??????
So,when are you going to look at the oil for metal.I keep saying this because you really need to know if it`s damage of improper assembly,as in beyond tolerances rom the get-go which is absolutely on the builder.I`ve had this happen.The bearings were .02 beyond.The guy took just a tad too much off and should have gone one more size under.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#33 |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
to thin down 4 quarts of 20w50 (which i run because i have a flat tappet camshaft)
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#34 | |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
Quote:
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#35 |
Account Suspended
Join Date: Apr 2009
Location: Oklahoma City
Posts: 4,709
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Re: Rod knock on an engine with 4000 miles??????
That's a bummer. Any chance of getting the builder to warranty the motor?
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#36 |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
I doubt it.
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#37 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: Rod knock on an engine with 4000 miles??????
you're going to drive a knocking truck!!!!
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#38 |
Account Suspended
Join Date: Apr 2009
Location: Oklahoma City
Posts: 4,709
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Re: Rod knock on an engine with 4000 miles??????
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#39 |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
I might would consider driving a knocking truck. but not one with low oil pressure.
this is OK I guess. I hope the bore is OK cause its already .060 over. This is the excuse I need to convert to a 383 stroker with forged pistons. but I'll have to sell my 4-wheeler to fund it
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#40 |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
Anybody want to make an offer on a '03 Honda Recon ES
here's the 4-wheeler and some of my truck
__________________
-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted Last edited by americanmusc1e; 04-18-2009 at 10:58 PM. |
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#41 |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
I shouldn't have put that on there, nobody's gonna want to buy it the way I drive it
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-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#42 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Rod knock on an engine with 4000 miles??????
I haven't taken the time to check each entry to this forum, but definitely pull the fuel pump and check the arm that runs it from the cam. If that has a lot of slop it will sound like a rod knocking and only does it under load.
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#43 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Rod knock on an engine with 4000 miles??????
new motor oil is suppose to be changed at 500 miles then at 1500 mile and every 3,000 mile after. on a new motor it is best to go easy on the motor for the first 3k miles of its life
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#44 |
Registered User
Join Date: Jul 2005
Location: AL
Posts: 1,828
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Re: Rod knock on an engine with 4000 miles??????
I shouldn't have put that on there, nobody's gonna want to buy it the way I drive it
BINGO
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#45 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Rod knock on an engine with 4000 miles??????
You only have to drain a little oil to test.You can always pour it back in.If there`s metal,you won`t be driving it anyway.If there`s none you just pour it back in.and,still shouldn`t drive it.The machining i`m talking about is on the crank and the bearings are sized acordingly.A builder could have lubbeb up on that and it woukd absolutely be his responsibilty.There would be no metal from damage,just beyond tolerance.
You say you cahnge it every 3,000 miles.How many 3,000s are in 4,000?That`s after a motor is broken in.You didn`t run it past 500 w/o changing your break-in oil did you?The next oil change should be at anither 1,000.then,go on the routine. It sounds like you think you need to thin 20w-50.Not at all.20w is very thin.That`s what multi-grade means.It`s 20w and everything between 50w,depending on motor`s needs and environmental changes.We used to run one weight in the cold months and go to thicker oil in warmer weather.Now you don`t have to think about it. If you ran the snot out of it rather than breaking it in along with running too long on thinned out oil I`d say you bought yourself an expensive lesson.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#46 |
Registered User
![]() Join Date: May 2006
Location: Wyman, Kentucky
Posts: 403
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Re: Rod knock on an engine with 4000 miles??????
I had a rocker arm stud that was worn on one side letting the rocker arm slide off the pushrod. The engine would idle but when I revved it up it would knock and loose oil pressure because the lifter was trying to come out of the hole. Easy to check out by removing the valve covers.
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1972 GMC Jimmy, 4WD, 454 CI, 350 Turbo, 4" lift, 35" tires The math teacher said my son "Bubba" could be a mathmatical genius. cause he's got 13 fingers! |
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#47 | |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
Quote:
__________________
-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#48 | |
Senior Member
![]() Join Date: Jan 2009
Location: Austin, TX
Posts: 1,079
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Re: Rod knock on an engine with 4000 miles??????
Quote:
__________________
-- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted |
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#49 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Rod knock on an engine with 4000 miles??????
It could be alot of things.But low oil pressure points away from most.Was the oil pump replaced?
I based my other remarks on the 4,000 mile statement.i guess it`s been knocking for awhile? I wish I could check it out.I hope it`s not too serious.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#50 |
Account Suspended
Join Date: Apr 2009
Location: Oklahoma City
Posts: 4,709
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Re: Rod knock on an engine with 4000 miles??????
Actually break-in oil should be changed immediately after the first 25 minutes of breaking in the camshaft. You make sure your lifters are properly adjusted, start the engine (without excessive cranking) immediately bring the engine up to 3000 rpm and then vary the rpms between 2500 - 3000. This causes the crank to throw oil on different areas of the cam. Immediately after the camshaft break-in, you change the oil, change it again at 500 (when rings have seated) and after that, every 2000 - 4000 miles depending on your driving style.
I will say this right now, your problem was not caused by not changing the oil. It could be that the cam was not properly broken -in and the metal shavings are chewing up your mains/rods or like previously stated, the crankshaft was not properly ground or bearings not matched. I'm getting the distinct feeling that this was not a "new" build?????? Are we talking about all new parts here and fresh machine work? Did you pull used crank and cam from another motor and just throw some new bearings on it? If it's a used cam, did you match the lifters back to the exact same lobes they came off of? |
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