ducky698 Posted November 5, 2011 Share Posted November 5, 2011 Hi, the 866 I have seems to be running well, its done 12000kms in 4 weeks. the oil pressure is scary tho, 30lbs then when hot it drops to 5lbs at idle. is this normal? if not how do i fix?its pulling a B double thats 62,000 kilo,sGrant Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/ Share on other sites More sharing options...
Lmackattack Posted November 7, 2011 Share Posted November 7, 2011 hmmm. thats pretty low IMO... I get scared below 20-25psi hot idle. It can be a few things. not specific to your engine but what I have seen ...stuck press relief springbad oil pumpbroken piston cooling jetsclogged oil pump intakelow oiloil pickup tube leaking (no suction.)thats a start but 5psi hot would scare me! Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90164 Share on other sites More sharing options...
miro Posted November 7, 2011 Share Posted November 7, 2011 Has it had any work done to it recently? Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90199 Share on other sites More sharing options...
BAD DOG Posted November 8, 2011 Share Posted November 8, 2011 should be 35 to 40 lb at idle and 60 to 75 when reved up depending on rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90241 Share on other sites More sharing options...
ducky698 Posted November 8, 2011 Author Share Posted November 8, 2011 Hi, thanks for the replies. no internal work done. i have had 2 heads off an fuel pump was changed, but it was this low prior to that. am not sure I even have correct oil in it. 15/40?? I am now using 20/60 diesel oil and its no better. took the heat exchanger off yesterday and stripped and rebuilt it, it was 30% blocked, still no good.Grant Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90276 Share on other sites More sharing options...
miro Posted November 8, 2011 Share Posted November 8, 2011 Have you tried a master oil guage to make sure its not a faulty guage or sending unit? Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90278 Share on other sites More sharing options...
ducky698 Posted November 9, 2011 Author Share Posted November 9, 2011 Hi did the master gauge today, still low. took sump off and found destroyed relief spring at back of pump. could not get another one. went to a spring works shop who are making another one to specs. so in the meantime I have got a suitable repair, the oil pressure may be a little high with 20-60 tho. Its now over 140 when revving till it warms up then drops to 90 and has 34 at idle.what oil specs do you use over there for these engines?Grant Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90359 Share on other sites More sharing options...
Rob Posted November 9, 2011 Share Posted November 9, 2011 Be careful Grant, that much pressure will destroy gaskets and seals quickly.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90370 Share on other sites More sharing options...
spud Posted November 9, 2011 Share Posted November 9, 2011 15/40 grant...........good too see you at paganellies yesterday! Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90371 Share on other sites More sharing options...
Rob Posted November 9, 2011 Share Posted November 9, 2011 Be careful Grant, that much pressure will destroy gaskets and seals quickly.RobI use 15W40 Delo in my V8 engines without problems.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90372 Share on other sites More sharing options...
ducky698 Posted November 9, 2011 Author Share Posted November 9, 2011 Hi, 15/40 it is then.thank you. I put the thicker oil in it to begin with due to the low oil pressure. now I gotta get the bugger down .does anyone have a pressure relief valve off one of these? the one thats half way down the block, I need to know what diam the spring is, what the thickness of coils are. as I am getting 2 new springs made up, one for the pump and one for this valve.Grant Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90396 Share on other sites More sharing options...
steamer Posted November 9, 2011 Share Posted November 9, 2011 Hi I posted a question about having to much oilpressure in my 673 engine on oct 2 and rhasler posted a copy of a manual with spring information and numbers I was able to order the rite one from a dealer and now run 60 at cold idle instead of 150 The information is still there and may help Dean Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90402 Share on other sites More sharing options...
f model Posted November 10, 2011 Share Posted November 10, 2011 When I get home I can dig up a spring and send you all the specs. It won't be till the weekend if that will help? Greg Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90406 Share on other sites More sharing options...
ducky698 Posted November 10, 2011 Author Share Posted November 10, 2011 Hi, that will be great thankyou. I have the specs for the spring, just not coil diameter an spring thickness. I think the oil pressure will drop with correct oil. Grant. Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90412 Share on other sites More sharing options...
shortstack Posted November 10, 2011 Share Posted November 10, 2011 Too much oil pressure can be harmful too. Can wash the bearings out. I think Cummins had an issue with this years ago. Trey Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90435 Share on other sites More sharing options...
spud Posted November 12, 2011 Share Posted November 12, 2011 lmao.........who told ya to put that oil in that motor grant.......it aint a diff bruv......who ever it was wants rippin a new one Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90655 Share on other sites More sharing options...
ducky698 Posted November 12, 2011 Author Share Posted November 12, 2011 i know you did, so did pags, but the book says different. i chose the 20/60 to help its oil problems, then when i went north i knew then it had a serious problem cause it dropped to 2 pounds, got back here and pulled it to bits. oil pressure good now. what were you doing near pags any way? not in Albany any more?Grant Quote Link to comment https://www.bigmacktrucks.com/topic/21447-866-oil-pressure/#findComment-90657 Share on other sites More sharing options...
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