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Joined: Jul 2002
Posts: 53
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2002
Posts: 53 |
I'm slowly reassembling the 56 235 that is going into my 49 3600. I had the head gone thru, crank was cut .010, pistons were already .060 over and almost new, cylinder honed, block serviced, etc. Looks like some one did a rebore, but left the original, very worn cam. I'm putting in a new 261 cam. the 47-53 shop manual call for initial assembly with 2 cam thrust plate gaskets behind the thrust plate, cking w/ a styraight edge to the crank gear. I guess this means making sure the cam gear is fully engaged with the crank gear. I have not been able to find the camshaft thrust plate gaskets locally. I talked to the machine shop that did the work and provides the gasket set and they said not to use those gaskets. I called Patrick of Patricks in Arizona and he said he had never seen a 235 with those gaskets??!!. Also, the manual calls for a genuine cheverolet gasket between 2 halves of the oil pump. Gasket set does not have, machinest says don't use, you will have higher oil pressure. Pls advise if I need these gaskets!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The oil pump gasket of the correct thickness is very important.
The original thrust plate required the multiple gaskets (if necessary).If you have a later thrust plate with the seperate inner spacing ring the gasket and measuring is unnecessary.The spacer takes care of it all the the end thrust measurement was changed to give a grester tolarance.
The oil pump gasket comes in the complete gasket sets.I could measure the thickness of one and you could cut one out of paper of the correct size.
With no oil pump gasket the gears will be too tight and will bind.If too thick the oil pump pressure willbe very low.
Gene Schneider
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
Posts: 6,149 Likes: 42 |
If I am right the oil pump gasket thickness is determined by measuring the depth of the gears below the face of the housing. Unless you are using new gears the depth will possibly be in excess of specified clearance with gasket already.
If this is the case either replace gears or assemble using a good jointing paste (eg loctite 515), not silicon.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Jul 2002
Posts: 53
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2002
Posts: 53 |
When the machine shop looked at the motor originally, I wanted to order a new oil pump. They said that the pump in there was almost new, and it was fine. He did replace the pressure relief spring and shimmed it. If some one can tell the the thickness of the gasket I'll make one. I'll eyeball the thrust plate again. thanks for the responses.
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Joined: Jan 2002
Posts: 175
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jan 2002
Posts: 175 |
Dave,
I'm surprised your gasket set didn't include one. I've got a couple of extras. PM me your address and I'll throw 'em in an enevlope for you.
Bob
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The gasket measures .009" to .010" thick - which is the thickness of the manila folders that I have.
Gene Schneider
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Joined: Jul 2002
Posts: 53
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2002
Posts: 53 |
Thx guys, I really appreciate it. I have a hot run from KC to Milwawkee to p/u oldest daughter from college this Sat, then next weekend the garage is all mine!
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