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Thread Title:

Hot oil-lower oil pressure


Created On Wednesday January 21, 2015 23:30 Diesel Talk
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moparmania
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Posts: 54
Joined: Dec 2008

Note Wednesday January 21, 2015 23:30 View users profile View thread in raw text format
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Hey guys its a 95 Detroit 60 DDIII, 370/430 - A while ago I saw the oil pressure going from a regular 50 down to a 48 at 1500rpm cruising 70 mph , a little drop I didn't think it matter. A couple of days ago I was going up a couple of long hills with around 40.000 # and when I started climbing the hill I realize that I didn't have as much power as I used to, the engine was struggling to pull up the hill ,I had to keep dropping gears ,I also didn't want to push it so hard so I kept my rpm's low .
the oil pressure was falling lower than normal I will say 30 /35 the oil temp was a little over 200 ,I kept the fan on all the time and the coolant didn't overheat, (I always put my fan on before it gets triggered); usually with that kind of load I can move faster up the hill . The oil probably has between 8 to 10.000 miles and at this point the truck has been on running for at least 18 hrs . When I got to a truck stop about 10 miles after the hill the oil pressure at idle was around 20 . I parked the truck let it idle for a little while and I had some white smoke
( like steam from the pot when you heat up water) but with not much pressure out of the crankcase hose and the dipstick tube. I added a 1/4 of Lucas and left it to cool off for a few hrs ,checked all the fluids and nothing was mixed up with the other. Then I drove another 250 miles with no problems , it seems to be a little slower on the hills .
I figured the oil is old and it couldn't take the beating so I'm draining it asap , but besides that what could cause the oil pressure to drop or the oil to get hot ? It doesn't smoke , or knock . the motor feels kind of hard or rough ,I don't think it sounds or feels as smooth as it used to be , may be because of the oil ? so far is not smoking or doing any noises what can I do to make sure everything is normal and I can haul another load ? I'm about 800 miles from home and I can't afford to do anything on this truck right now . The oil pressure went back to normal , when I started it this morning went up to 75 and it dropped to 50 after it warmed up.
Thank you guys for your thoughts .

I did hear some kind of scraping on a cold start this morning but it went away right after the engine started I will say a few seconds and it sound it normal oil pressure went up to 75 and then down to 50 after 10 or 15 minutes


Edited: Thursday January 22, 2015 at 08:04 by moparmania
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JoeZ
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Posts: 938
Joined: Dec 2008

Note Saturday January 24, 2015 05:19 View thread in raw text format
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I would check the drain plug after sitting overnight and drain a small amount og oil and check for metal. Could be worn main bearings..

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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