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#1 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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What should I do to my old inline 6..?
Alright, it's 43 years old, temperamental as hell, never been taken apart, and I don't know enough about engines to know what to do. Problem is, it's always wanting to die, (Yeah, the timing on it's fine) it's always wanting to choke down, unless your just driving down the road. When you come to a stop sign, it sometimes won't choke down, or it'll try but it's always something.. I'm guessing since it's 43 years old, never been torn apart to be rebuilt could be part of the problem. A friend told me 43 years of carbon build-up on the pistons probably isn't good. Say I took a leap of faith, pulled the engine myself, what would I ABSOLUTELY need to replace, and what would I need to clean for it to run smooth all the time. Also, after cleaning the engine I'd install electronic iginition & new exhaust. So anyone's opinion would be great! Thanks. Is it something I could do myself?
![]() EDIT: The carb has been rebuilt within the last 6 months
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 Last edited by LandonL; 06-16-2010 at 09:35 PM. |
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#2 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: What should I do to my old inline 6..?
I would have rebuilt the carb before I pulled the motor. What do mean by "won't choke down"?
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#3 |
yes, i do
Join Date: Jun 2007
Location: Spokane, wa
Posts: 2,734
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Re: What should I do to my old inline 6..?
i would also start with rebuilding the carb, then a tune-up. after that i would also pour some atf down the carb while its running to help with the carbon build up. when atf burns the detergents in it help to clean the valves and combustion chambers. but you gotta do it slowly with the engine running at about 1500-2000 rpms. and don't be supprised of the smoke you will see.
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ERROR 404....... SNAPPY COMEBACK NOT FOUND ![]() _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900 Last edited by 60ratrod; 06-16-2010 at 09:33 PM. |
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#4 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: What should I do to my old inline 6..?
Same question I have asked myself.
I have a '67 swb stepper with a 250 I-6 from a 1970. It doesn't use oil and starts easy. What I am going to do is the normal tuneup stuff, it already has Hei. I think the carb needs some attention so I am going to rebuild it. I will run a tank of fresh gasoline with some Sea Foam through it. Based on the tune up and carb rebuild results I will decide what to do next. Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#5 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
I wrote that in kind of a hurry, sometimes I'll have the problem and sometimes I won't. For example, today I pulled into a gas station after driving it for 10 minutes, turned it off, filled up started it pulled out onto the road straight to a stoplight and it wanted to die down. Sometimes it'll do this even after it's been started for awhile. It'll be idling and after a good while it'll try and die. We had the carb rebuilt recently.
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#6 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
I'm thinking about doing a complete engine rebuild to prevent any problems in the far future, I wan't to keep the inline 6 to stay original and it's a good engine. But before I overhaul I'd much rather know if cleaning the pistons etc, and replacing smaller parts would help.
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#7 | |
Registered User
![]() Join Date: Nov 2002
Location: NM
Posts: 705
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Re: What should I do to my old inline 6..?
Quote:
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#8 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: What should I do to my old inline 6..?
Well, I'll have to take the opposite side on this.
Does the engine smoke, burn oil, or make any knocking noises? If no, run a compression test on it. If it passes that, you will gain nothing by tearing it down. All of your problems are external, like ignition or fuel. Ray |
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#9 |
Registered User
Join Date: Jun 2009
Location: Idaho Territory
Posts: 32
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Re: What should I do to my old inline 6..?
A driveability issue like you describe doesn't indicate a rebuild is necessary. I'd take it to the guy who rebuilt your carb and see if he can set it up to run right for you.
Only after a thorough diagnosis, including compression test and blowby test, would I consider a rebuild.
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"..not ashamed of the gospel" Rom. 1:16 1968 C10 (newly acquired) 1967 Checker Marathon (waiting for paint) 1968 C50 Service Truck (resting in peace for now) I need another project like I need another hole in my head!!! |
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#10 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
After listening to the noises of engine knocking on youtube, I've realized that was the noise MY engine has been making. What should I do, adjust the valves?
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#11 |
Registered User
Join Date: Jan 2008
Location: Tejas
Posts: 691
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Re: What should I do to my old inline 6..?
Knock means rebuild time. Not valves
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'72 cheyenne super step, '05 long bed gmc |
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#12 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
Well, considering no ones probably ever taken the block apart in it's 43 years of life it's probably time. Anyone know a place to buy a good 250 Kit?
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#13 |
yes, i do
Join Date: Jun 2007
Location: Spokane, wa
Posts: 2,734
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Re: What should I do to my old inline 6..?
ebay.
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ERROR 404....... SNAPPY COMEBACK NOT FOUND ![]() _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900 |
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#14 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
Should I do the master kit?
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#15 |
Registered User
Join Date: Jan 2008
Location: Tejas
Posts: 691
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Re: What should I do to my old inline 6..?
You can use 307 small block pistons to bump the compression up
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'72 cheyenne super step, '05 long bed gmc |
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#16 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
The only other thing is I have virtually no knowledge on how to do most of the stuff, is it pretty much straightforward learning?
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#17 |
yes, i do
Join Date: Jun 2007
Location: Spokane, wa
Posts: 2,734
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Re: What should I do to my old inline 6..?
get yourself a good chilton's manual and follow it step by step. its fairly easy, just tedious with all of the specs that need to be met, like checking the bearing to thrust surface clearance on the crank for one
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ERROR 404....... SNAPPY COMEBACK NOT FOUND ![]() _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900 |
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#18 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
Im not going out to the shop to check (1AM here) I have a Haynes manual already, you know if it covers the engine? Well, the rebuilding parts.
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 Last edited by LandonL; 06-17-2010 at 01:13 AM. |
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#19 |
Registered User
Join Date: Mar 2008
Location: Lawrenceville, Ga
Posts: 300
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Re: What should I do to my old inline 6..?
Hey LandonL,
Hello Lawrenceville, Ga. The Haynes may cover some general engine services but wont get deep into a rebuild. I like that you would rather stick with the I6, I think it's a sweet engine. There is plenty of information available either searching the web or countless number of books. It was mentioned above, unless there is an obvious knock, I would have started with the carb, fuel lines and tank first. Have you considered a budget yet? Last edited by Kayotic; 06-17-2010 at 01:26 AM. |
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#20 |
Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: What should I do to my old inline 6..?
summit has a rebuilt kit for a v8 for around 350 bucks im sure they have it for an I6.. comes with new pistons bearings and seals and what not
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1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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#21 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: What should I do to my old inline 6..?
Look into a new distributor also. I had one that was worn out and the timing would jump around when trying to set it (as told to me by a reputable mechanic). Temperamental was a good way to describe how it drove.
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#22 |
Registered User
Join Date: Dec 2009
Location: Atlanta, Ga.
Posts: 1,050
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Re: What should I do to my old inline 6..?
Is there any smoke out of the exhaust just before it dies down? "and do you have a fuel filter on it any where?
Last edited by chopnchaneled; 06-17-2010 at 03:04 PM. |
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#23 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
Yeah, it has a new fuel filter and fuel pump.
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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#24 |
Registered User
Join Date: Dec 2009
Location: Atlanta, Ga.
Posts: 1,050
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Re: What should I do to my old inline 6..?
YEAH it smokes? if so what color?
By the way if your ever around Buford, give me a shout. I'm in friendship ind. park @ 985 and friendship. I just picked up a 68 stepside with inline 250 and 3 on the tree had a problem with the points closing when i first got it. |
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#25 |
Registered User
Join Date: Nov 2009
Location: Georgia
Posts: 440
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Re: What should I do to my old inline 6..?
Sorry, I meant yeah as in yeah a new filter, no smoking.
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---| 1967 GMC Stepside |-- 250 L6 .030 over ---| 1985 Porsche 944/1 |--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 |
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