Posted by buickanddeere on March 11, 2009 at 05:29:24 from (216.183.136.2):
In Reply to: Detroit Diesels posted by HeyPigFarmer on March 11, 2009 at 04:53:46:
I have a 2-53 that will start in 3-4 turns at 30F without ether or pre-heating. How does that happen?
This problem is seen all the time after econo or blotched rebuilds. Somebody throws in set of rings on the old style "S" series pistons, without measuring end gap.A set bearings on the bottom end without measuring. Then grind the valves and seats which increases combustion chamber volume and further lowers compression pressure. Now they toss in the old "S" sereis injectors and set them to "that loosk good". Deck height, what is that? Now these people try to start this "rebuilt engine" that is blowing by the rings, has lower compression than when it left the factory with the "S" series pistons. Lousy spray pattern from the injectors and late injection timing. Well duh..........it isn"t going to start because YOU blotched the job.
New "N" series sleeves and high compression pistons. "C" series injectors.New valves and seats.Piston to head clearance within spec. Late series improved spray pattern "C" injectors properly timed. Tear down that "rebuilt" engine of your and measure everything. And you will get laughed out of the shop.
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