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Priming the 855 After Overhaul

Posted By Ol' Kenny Saturday, January 05, 2019 12:59 PM
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Ol' Kenny
 Posted Saturday, January 05, 2019 12:59 PM
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Guys,

Any suggestions for priming my 855 after an overhaul before starting the engine? The manual specifies to remove a plug from the oil pump housing and use a pump to prime to 30 psi pressure. Do you think a small hand pump would work for this? Would you prefill the oil filters? Any help would be appreciated. Thanks guys.
Geoff Weeks
 Posted Saturday, January 05, 2019 1:16 PM
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To be honest, I lube the bearing and bores when assembling, then just fill the crankcase and by the time the fuel system has primed, the oil system has also. Yeah, I fill the oil filter, but that is it.
Ol' Kenny
 Posted Saturday, January 05, 2019 1:33 PM
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I like that answer Geoff.....assembly lube was used so I'll just fill er' up and away we go. Thanks for all of your help and advice with this project!
Geoff Weeks
 Posted Sunday, January 06, 2019 2:11 AM
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I guess I should add, that this is after an inframe, If it was a Hot tanked block and new oil pump (dry) I would add some oil to the pump to "prime" it. I took apart an engine that sat for over 10 years, and there was still oil on every surface inside.
cat herder
 Posted Sunday, January 06, 2019 12:20 PM
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I ran across the dry start up problem once before. I had a pressure paint pot that was clean, kinda looks like a pressure cooker,a few fittings and a hose to the oil pump plug,and 30 psi to the pot. the oil gauge went to 30 psi,worked well. used what I had laying around, just another way to pressurize system. forgot to say , fill pot with oil! good luck.
Two-Books
 Posted Sunday, January 06, 2019 12:39 PM
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When I worked for a factory Cummins Dealer back in the 70's all engines inframed as well as out of frame got the same thing after a pre lubed assembly, filled with oil then got spun over with the fuel solenoid shut off and when the pressure was up on the gauge we lit em up. Out of frames were run in on the dyno and the trucks hit the chassis dyno and got the same treatment. Pulled em hard after temps were up and turned em loose.

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Ol' Kenny
 Posted Monday, January 07, 2019 1:18 PM
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Two-Books - How did you prime the oil pump? Did you just remove the plug from the housing and then fill with oil or did you pump oil in under pressure from some sort of hand pump?
Two-Books
 Posted Monday, January 07, 2019 1:52 PM
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We never primed anything, all component's when re-built were lubed on assembly. I can't remember any that didn't pick up immediately and there was pressure at the guage in seconds. Filters if spin on were pre filled but that was it. Even the big 1710's that came in from the coal fieilds that got majors in the engine shop were put on the dyno after the rebuild were just filled up with oil then spun over until pressure came up which again took seconds then they were fired up and checked for leaks warmed up to operating temp then got the business for about a half hour, rechecked then painted and shipped out.

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