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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2015 Posts: 58 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2015 Posts: 58 | Hi everyone. I am having trouble removing the oil pump. I can't seem to get the bolt holding the pump in off. It wouldn't budge and I didn't want to break the head off. Is there anything special that I need to do to get this bolt off or any suggestions? | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Gentle heat will solve most issues.
Ed
Last edited by EdPruss; 06/14/2016 7:36 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Have you loosened the lock nut?
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2015 Posts: 58 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2015 Posts: 58 | What does the lock nut look like/where is it? | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I am going to assume you must be trying to remove the pump by removing the two bolts with round heads on the outside of the engine. DO NOT DO THAT!
The bolt that holds the pump in is on the inside of the engine. It takes a 1/2" wrench, and has a lock nut on it tightened against the block to prevent it from loosening. The lock nut takes a 9/16" wrench.
Sorry, I could not easily come up with a picture.
I am assuming you are asking about a 1937-62 engine.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2015 Posts: 58 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2015 Posts: 58 | I was trying to remove the lock nut and bolt but I was being too gentle. I have it off now but the pump will not come out. I loosened the nuts on the pipes and those are loose but the pump still won't come out. | | | | | Joined: Mar 2010 Posts: 10,275 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,275 | Tap the sides of he pump with a hammer to break the junk loose.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Apr 2015 Posts: 336 Shop Shark | | Shop Shark Joined: Apr 2015 Posts: 336 | Use a rubber or leather mallet if you have one..
1959 3100 Apache Fleetside
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | A slight twisting and pulling has worked for me.
See the USA in your vintage Chevrolet! My Blog | | |
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