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A251 sleeves, deck hight

S

shawnspeed3

Member
Are the sleeves supposta be flush , or protrude above the deck on these gas motors??? I am having a headgasket sealing issue on one sleeve, and it is slightly below the deck...the other sleeve is slightly above...Thoughts??? I am thinking about making a shim to duplicate the measurement on the cylinder that isn't leaking. Any thoughts /suggestions would be appreciated. Shawn
 
did you have sleeves out? if not it may be that the o-rings are shot at bottom of sleeve
the sleeves should protrude all the same like .003" or something a shop manual will have info i could look it up in my book for you but i would suggest you remove all sleeves replace o-rings.
was it a runing engine? did it leak coolant into crankcase?
 
If the sleeve is below the deck you will need to pull the sleeve, cut the counterbore with a special tool, and install a special shim in the counterbore between the sleeve and the block. The counterbore is not cut parallel to the block deck. It is cut at a slight angle to match the angle on the sleeve. If they do not match exactly the sleeve will crack. No short cuts or you will pay more yet in the end.
 
DK nailed it, the block is crooked and a shim will not correct that. The counterbore has eroded and allowed that sleeve to settle in the block. O rings will obviously not correct that. As stated there is a tool to correct the counterbore BEFORE shimming to assure the counterbore has the proper uptilt to support the sleeve.

mEl
 
Thanks for the reply ....a little more history is in order....the Sleeve in Question is NOT the correct one....It is from a 770 I believe, as it is identical other than the top of the sleeve where it seats in the block is smaller, by 1/16". I made a ring to center it up,and all was well for several hundred hrs.. The sleeve still had purchase on the counterboar, but I will pull it and see what I cant figure out , before it gets warm...anybody got a pic of the special C-bore tool??? I don't feel like breaking the tractor to put the block in the B' port...Thanks again Shawn
 
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