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Restoration & Repair Tips Board

Re: Newly Overhauled Engine Somewhat Tight

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Author  [Modern View]

10-18-2012 16:51:29

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I remember installing the pistons in this engine (Continental F-162): I did not have to drive them in or anything like that, but there was significant friction which obviously came from the rings. The oil rings are the type which use an upper and lower thin ring with an expander behind. They are designed to wear in very quickly. I checked the end gap of each individual ring in the bore where they were installed, but as I recall there is no end gap on these oil rings.
In short: I am not surprised at the amount of friction in this engine, given my experience installing the pistons.I've barred it around probably 25-30 revolutions, timing the magneto, etc. It has compression in each cylinder, and it does not have any particular tight spots. The block was bored and honed, and the crank was inspected and polished, in a professional shop long in business and of high repute. Since I can't tow-start a Lincoln welding machine, I wonder how I'll ever get it started.

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Mike M

10-30-2012 13:45:48

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 Re: Newly Overhauled Engine Somewhat Tight in reply to Wascator, 10-18-2012 16:51:29  
I'd be concerned about the end gap on the oil rings. The expander may not be in right or the thin rings not sitting right ? I also go thru and check out the starters,alt. or gen.,water pumps & radiators on any engine job I do because the engine is going to crank harder and run hotter then when worn out.

I can't say as I have ever had trouble starting a fresh rebuilt engine. I crank them up without spark plugs or injectors to get oil pressure first too. Also use engine assy. lube on them when going together.

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David G

10-18-2012 18:16:47

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 Re: Newly Overhauled Engine Somewhat Tight in reply to Wascator, 10-18-2012 16:51:29  
If the starter, connected normally, with a charged battery will not turn it over then something is wrong. It can take quite a bit of effort with a bar to turn over a new engine.

If you still have the pan off, make sure the rods are not binding. The rods on my 44 were not reconditioned correctly, and caused it to bind. I got them fixed and it is fine.

What did you gap the rings to?

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