cm870 wont crank hot

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(10-13-2019 )Brock Wrote:  With good oil pressure I'm going to not assume major engine issues and believe you have 2 seperate simple issues.......

http://rawze.com/forums/archive/index.ph...420-2.html

Oil cooler and oil thermostat for your oil temps.

As far as not starting hot, I dont really care that 2 shops tested the starter, what I care is did they test it when the engine wouldn't normally start?

Example: I brought my ecm to Cummins to bench test, they said it was good, I had already verified it was not so i told them to test again, they said it was good again..... I told them to get it hot and keep bench testing it as I'm paying for the tests so stop whinging.

Finally it failed once warm and kept failing.

I've seen this so many times over the years and your starter could be the same..... heat causes metal to expand, bearings seize up while cooling and wont let it engage.

Barring the engine while warm may give you a idea. I'd properly test that starter or just swap it.

going on 3rd starter in a year..... on my way to harbor freight right now to get a 3/4 ratchet and try barring it over... im driving the truck over there o its good and hot when i get home...

if the cooler was bad would it not have high oil temps at idle? it would come down to 1 degree delta at idle? im not sure ive never had a bad cooler on a cummins... i know ever other engine ive had a bad cooler usually has big deltas at all times... not sure on a cummins though