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Glow_Plug
Member
Member # 19706
Reged: 02/10/02
Posts: 779
Loc: Cincinnati
Cummins 855 SC Low Oil Pressure
#1468877 - 11/07/03 10:04 AM

Okay, my dad was having a new clutch and a few other things done to his dump truck by a good friend of his. The friend is an experienced heavy mechanic. While doing those things, he had his friend change the oil, oil filter, and and the Lubrafiner filter. He also replaced the piston coolers, as most of them were leaking pretty bad. My dad gave him Rotella 15W-40 to use.

Now the truck is experiencing low oil pressure. Before the work, it would idle around 20-30 pounds and with a little RPM would easily hit 80 pounds cold. After it warmed up, it typically went down the road at about 50-60 pounds.

Now it maintains about 10 pounds at idle and won't go over 28 pounds going down the road. No visible leaks.

Some one else suggested that maybe my dad should use straight 40W oil instead of 15W-40. Doesn't sound right to me, but I don't really know what this older 855 calls for. I also suggested that my dad pull his lubrafiner filter and make sure it was installed correctly and not damaged.

Any thoughts, comments or suggestions?

L. Wilkinson
Member
Member # 11879
Reged: 03/11/01
Posts: 820
Loc: Abbotsford, Canada
Re: Cummins 855 SC Low Oil Pressure new
#1468968 - 11/07/03 10:53 AM

The Luberfiner is a bypass type filter and won't have much of an effect on total oil pressure. As well 15W40 shouldn't be too much of an issue, I might try pulling the main oil filter and try a new one.
Otherwise ensure there wasn't any difference between the old piston cooling noozles and the new ones, a difference in inner diameter or orifice could explain more flow and loss of pressure. What condition were the old ones in?

Glow_Plug
Member
Member # 19706
Reged: 02/10/02
Posts: 779
Loc: Cincinnati
Re: Cummins 855 SC Low Oil Pressure new
#1469157 - 11/07/03 12:19 PM

I just thought if the luberfiner was leaking internally, it would blead of pressure.

I just talked to my dad and he said the old ones looked fine, they just leaked like a sieve. The old ones were metal and the new ones are plastic. What you are saying makes sense though. I think he is going to see if he can locate some new o-rings and try putting the old ones back in. See what that does.

Lowboy
Member
Member # 123
Reged: 04/02/99
Posts: 328
Loc: Minden Nevada USA
Re: Cummins 855 SC Low Oil Pressure new
#1469355 - 11/07/03 02:10 PM

Iíve never seen plastic nozzles used on the small cam.

Good move... Iíll bet if you re o-ring the old nozzles the problem will be gone..

Glow_Plug
Member
Member # 19706
Reged: 02/10/02
Posts: 779
Loc: Cincinnati
Re: Cummins 855 SC Low Oil Pressure new
#1478188 - 11/12/03 04:16 PM

Well, he got all the old piston coolers back in with new o-rings. Still didn't help.

he happeend to mention it to my uncle, and he told him to double check his oil level. Sure enough, it was low by a couple gallons. Filled it the rest of the way up and everything was back to normal.

Poor dad is usually on top of things like that, but I guess he assumed his mechanic friend was as anal as he was when it came to working on stuff.

Thanks again for taking the time to respond!

B1powered
Member
Member # 34782
Reged: 09/14/03
Posts: 792
Loc: South Central Pa.
Re: Cummins 855 SC Low Oil Pressure new
#1478593 - 11/12/03 07:55 PM

Did you check the oil pickup tube for debris clogging the screen??
Was it removed and if so did you use a new gasket upon install?

L. Wilkinson
Member
Member # 11879
Reged: 03/11/01
Posts: 820
Loc: Abbotsford, Canada
Re: Cummins 855 SC Low Oil Pressure new
#1479101 - 11/12/03 11:43 PM

Forgot to mention that, the luberfiner holds quite a bit of oil, and if the service person doesn't bleed it & just assumes the crankcase level is good it will drop quite a bit as the housing fills once the engine has run. There is a small plug on the lid that allows bleeding, same as the drain plug. Pretty old technology these days

Glow_Plug
Member
Member # 19706
Reged: 02/10/02
Posts: 779
Loc: Cincinnati
Re: Cummins 855 SC Low Oil Pressure new
#1479436 - 11/13/03 08:48 AM

Well, I talked some more with dad. The mechanic did pre-fill and bleed the luberfiner as well as the oil filter. It appears the mistake was, they filled it until the dipstick read full, ran it for 20 minutes and let it sit, then topped it off to the full mark again.

Turns out that the dipstick reads full at something a little over 7 gallons, when the truck should hold 10. I don't know if it has the wrong dipstick, dipstick tube, or just part of the low quality control of American 70's manufacturing. There is a homemade notch at where the oil level sits now, so the previous owner probably did steal the dipstick from something else.


B1powered
Member
Member # 34782
Reged: 09/14/03
Posts: 792
Loc: South Central Pa.
Re: Cummins 855 SC Low Oil Pressure new
#1482433 - 11/14/03 09:45 PM

Quote:

Did you check the oil pickup tube for debris clogging the screen??
Was it removed and if so did you use a new gasket upon install?




B1powered
Member
Member # 34782
Reged: 09/14/03
Posts: 792
Loc: South Central Pa.
Re: Cummins 855 SC Low Oil Pressure new
#1484272 - 11/16/03 10:19 AM

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