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| Mark
12-04-2004 12:07:03
64.42.207.202
9913
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I have a 1975 brockway truck with an 855 Cummins engine and I am getting coolant in the oil and oil in the coolant. This only happens once in a while this fall when hauling from the combine on the morning check I was down about an inch in the rad didn’t think much of it the day before was hot and was hauling down soft road with big load.
The next evening after hauling all day while unloading I could smell antifreeze vapour was coming out the crank case vent the next morning I was low a gallon and half of coolant. I checked the oil and it was not up so I cracked the oil drain plug and about half a cup of lumpy grey oil came out where did the antifreeze go.
Yes this engine is wore out and has lots of blow by and I want to over haul it but would like to find the leak before I send that much money on this old truck. Thanks hope you Cummins guys can help. Ps I have the pan off with 20 lbs. pressure in the block and no leak block heated to about 100F
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| Mark
12-08-2004 05:11:00
64.42.207.202
9935
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Re: 1975 855 cummins in reply to Mark, 12-04-2004 12:07:03
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| Took the engine apart yesterday and found the problem it has pited liners and one was though on #1 right at the bottom. The engine was badly wore but all standerd yet new pistons,sleves and bearing I will Be back on the road. Just one more thing should I change the rod bolts. Thank for the help and have a merry Chistmas.
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| JimKS
01-03-2005 20:46:13
66.232.197.165
10013
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Re: Re: 1975 855 cummins in reply to Mark, 12-08-2004 05:11:00
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| As long as the rod bolts look good, there's no need to replace them. I worked at a cummins dealership for about 4 years and rarely if ever replaced a rod bolt. I work at a Deere place now, and we replace every rod bolt we come across. I don't think it's neccesary, though- I think Mother Deere just wants to sell parts.
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| oldoak
12-04-2004 13:08:27
67.136.141.113
9914
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Re: 1975 855 cummins in reply to Mark, 12-04-2004 12:07:03
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| Your leak could be coming from several areas, but here are some. #1. Rubbers on a sleeve #2.from a head or head gasket #3. inner cooler.
Hope this helps.
Send me an e-mail, I will try to help you. You need a "Stant coolant checker, also called a radiator checker. Drain oil from pan. Use checker, and pump 8 p.s.i. into radiator. If you have coolant coming out of pan, it is the sleeve rubbers.
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| Mark
12-04-2004 13:34:33
64.42.207.202
9915
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Re: Re: 1975 855 cummins in reply to oldoak, 12-04-2004 13:08:27
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| I have the pan off and 20 psi in the block at all time with a regulator from the air compresure I have blocked presure from rad and heater core. I turn the engine half a turn about every two hour during the day.
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| Larry Read
03-12-2005 22:04:20
66.82.9.80
10386
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Re: Re: Re: 1975 855 cummins in reply to Mark, 12-04-2004 13:34:33
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| I also have an 1975 855 in a CROWN firecoach that is presently pumping oil into the radiator.
It looks like thick gray paint. This just started
no overheating. The Truck pulls strong as an OX and no smoke from exhaust as well as no water at all in crankcase. Where is the internal oil cooler located? Did this other fellow ever get problem resolved? Any and all help greatly appreciated. This is a volunteer dept and our only engine.
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| bjr23
12-06-2004 13:59:07
64.185.102.32
9927
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Re: Re: Re: 1975 855 cummins in reply to Mark, 12-04-2004 13:34:33
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| I used to know a little 'bout cummins, not so much on the new engine. Maybe take a look at the oil cooler. Sounds as though your on the right trail. Old trucks and engines are a real expense, got to have something payin' for their upkeep to be able to keep'em around. bjr23
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