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Restoration & Repair Tips Board

Re: Newly Overhauled Engine Somewhat Tight

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Author  [Modern View]

10-13-2012 19:28:43

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yes.. it's a bit normal to have more drag on a new rebuilt engine than a sloppy worn out one.

did you use assy lube?

did you plastigauge it to make sure the crank and bearings are matched up and correct clearance.

ring end gap correct?

you can run it over a bit with plugs out to cut the 90-130 psi compression to help turning it over.. parallel up some bats to help.. if it is 6v jump it with 12v.

run it with plugs out till oil pressure comes up.. then put em in and jump with paralleled bats / 12v bat on the 6v starter, if it is 6.. etc..

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10-14-2012 10:55:16

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 Re: Newly Overhauled Engine Somewhat Tight in reply to soundguy, 10-13-2012 19:28:43  
Yes, all measurements were made and are correct. A well-qualiifed shop did the crank, which needed a polish only; installed bearings, cam and new bearings. Engine turned very freely until the pistons and rings were installed. Everything torqued correctly. Assembly lube, etc.
It's just amazing how much drag rings create until they wear in a little.

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10-14-2012 12:26:53

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 Re: Newly Overhauled Engine Somewhat Tight in reply to Wascator, 10-14-2012 10:55:16  
It is a something that adds up. The bearing have some drag then you add the cam and the pistons and rings etc it all adds up to a point that yes it can be hard to spin one over. As long as all parts including the rings are lubed like they should be all will be ok as long as the oil pressure comes up also

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