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#1 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Clankety Clank low oil pressure (I think?)
Hello all,
Sure hope someone can diagnose the sound I am hearing from my truck ![]() First off, I did not install the current engine in the truck. Bought it with no knowledge of any work done before I got it. What I do know is they took out the 454 and hopped up a 350 with cam (not sure if rad or mild) and mounted to the existing tranny. I am going to get a crate engine to return to 454 status in Feb (tax time whoo!) but I need your help to get there as I believe I am running on borrowed time and want to make sure I am not going in the wrong direction. Problem: When the engine warms up, at idle in gear when you start from a stop and give power, the engine will make a clankety sound like someone looking for their favorite iron skillet buried in an entire cupboard of the same. What I don't get is sometimes (some days) the sound is much more pronounced then others. It also (sometimes) makes more noise when turning to the right. I have tried different oil weights, engine treatments and such. Doesn't seem to matter. However, it will NEVER do it after initial start when cold until it is warmed up. Does clank when cold right after starting but only lasts for a couple of seconds which I can understand. I can run for a good 10 minutes before I hear it again after a start when the engine is cold. I have replaced the the u-joints as they went bad just in case. Problem remains. Any ideas? thanks for the time, Spline64 |
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#2 |
Senior Member
![]() Join Date: Feb 2010
Location: Maumelle, AR
Posts: 478
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Re: Clankety Clank low oil pressure (I think?)
Check your flex plate to be sure it isn't loose or cracked. Make sure your fuel pump isn't toast (if it's mechanical).
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#3 |
Registered User
Join Date: Dec 2008
Location: Foristell, MO
Posts: 418
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Re: Clankety Clank low oil pressure (I think?)
Will it make this noise not in gear at idle? How about when you ramp it up sitting still? If it doesn't make the noise when you are actually moving that could eliminate internal engine issues altough things change under load.. Things loosen up when the temp. comes up so an engine noise at operating temp. can be concerning. I'd start trying to systematically eliminate things. Motor mounts tight? tranny tight to motor? tranny mount good? noise not in engine? noise in drive train? I had a flex plate that was cracked but in this case it sounded more like a throw out bearing going bad. Good Luck.
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#4 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Re: Clankety Clank low oil pressure (I think?)
Thanks for the quick responses!
Thought about the oil pump as well, may have to come to that. Fuel pump just got replaced (is electric and familiar with that sound) so that is good. When at idle and not in gear, can't really hear anything pronounced, just the lifters and if I get down under the truck, same thing. Ramping it up doesn't seem to make more or less noise either (in park, engine hot). Rear main seal leaks, I'd say a good 3-4 inch dia. puddle on concrete after every drive. Not sure if that helps. Did some more testing / driving and noticed something peculiar. The sound almost goes away in reverse and immediately comes back when I go forward (engine hot). Could this have something to do with the flex plate? thanks! Spline64 |
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#5 |
Registered User
Join Date: May 2010
Location: Reno Ne-VAH-da
Posts: 594
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Re: Clankety Clank low oil pressure (I think?)
If your driving the truck and it has not thrown a rod i would say pull out your trans and check that flex plate!
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#6 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: Clankety Clank low oil pressure (I think?)
It could be the flexplate. as it wears more, it will make the noise all of the time. You might be able to set the converter back enough to see where the flex plate bolts to the crank. that's where they usually crack.
__________________
1974 Jimmy- 5.3/4L80e/NP241 |
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#7 |
Senior Member
![]() Join Date: Feb 2010
Location: Maumelle, AR
Posts: 478
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Re: Clankety Clank low oil pressure (I think?)
Yep, I've seen them bust the center completely out.
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#8 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Re: Clankety Clank low oil pressure (I think?)
again thanks all for the replies!! I really appreciate all the time you are all taking!!
I love it when you think you have something narrowed down only to have it change..... ![]() Update: Now today for the first time it made the sound in park (engine hot and only between idle and about 2000 rpm). Was about half as loud as when in drive going under 5mph. Did it in reverse as well. Much louder today then ever, thinking I need to park this beast. But again going to work this morning when it was cold, quiet and solid as a rock. Can a mechanical oil pump make an obnoxious sound while in it's death throws? The only constant that I have now is that it only happens at low rpm and oil pressure. I don't think my gauge is working correctly as when cold is pegged over 60 psi, when hot at idle is at about 30 psi which I believe should be more than enough. thanks all, Spline64 |
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#9 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Re: Clankety Clank low oil pressure (I think?)
and another edit...noticed that when oil gets to the low on the dipstick, sometimes has bubbles on it. Thought that was only on overfilled engines but doesn't happen when at the full level.
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#10 |
Registered User
Join Date: May 2010
Location: Reno Ne-VAH-da
Posts: 594
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Re: Clankety Clank low oil pressure (I think?)
Your oil pressure gauge sounds fine, 30 pounds warm should be plenty. If it quit making the noise in reverse that kinda does sound like your flexplate.
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#11 |
BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,262
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Re: Clankety Clank low oil pressure (I think?)
I wouldnt put lock tite on those bolts.... just screams bad idea
clint
__________________
1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress |
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#12 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Re: Clankety Clank low oil pressure (I think?)
What would you do then?
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#13 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Re: Clankety Clank low oil pressure (I think?)
also, will be replacing entire engine in Feb of next year. Just want to get through half the winter.
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#14 |
Registered User
Join Date: Aug 2010
Location: Lost Wages, NV
Posts: 201
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Re: Clankety Clank low oil pressure (I think?)
Any speed shop sells locking header bolts, summit jegs etc.
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#15 |
Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: Clankety Clank low oil pressure (I think?)
When that loc-tite gets cooked in place, it's as good as a weld.
Get some locking header bolts, they're a more-better way to get 'er done. |
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#16 |
Registered User
Join Date: Sep 2010
Location: Gardnerville, Nevada
Posts: 68
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Re: Clankety Clank low oil pressure (I think?)
Thanks all!!
Will do ![]() Spline64 |
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#17 |
Registered User
Join Date: May 2010
Location: Albany Oregon
Posts: 71
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Re: Clankety Clank low oil pressure (I think?)
or you could just trow some crush gaskits and new bolts and check them every once inawile
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