Oil Pressure Problem 351w

1100 is not that much on this engines..mine actually went almost 2k before one of the heads cracked..could have lasted some more time if that didn't happen...

Hmm Seams everyone has the same conclusion i have come up with, bottom end bearings! can i just replace those? or would it be a waste of time? the engine just runs so happy dont relay wana spend money on complete build, i don't think 1100 was a massive amount of hours. will have to look out for this LUCAS stuff see if i can get it here. also will change to 20/50 see if that helps for now! still got at least another 2 months of boarding to get in this summer!

MorganB wrote: Hi everyone Just over the last few trips i have had a couple of problems with my oil pressure in my 83SN its fine for the half hour or so (40psi) then it drops way of to like 5 at idle and 20 running, the 1st time i saw it i went straight home checked oil level, was a bit low but nothing to cry home about, so i topped it up (15w40), ran it on a hose for about 15 min and everything was normal! so went out again last night and same again after a while it dropped off, not as far as the 1st time but still under 15 at idle and max of 30, everything sounds normal to me no major leeks (always had 1 small one out of the main end seal) what do u think could be the issue? the engine has done 1100 hours so its not in mint condition but it starts first pop every time has heaps of power for what i need and i never run it much over 3500rpm in fact most of the time only about 1800rpm.

Put a mechanical gauge on the engine and verify that you actually have low pressure. 1100 hours isn't much.

i dont condone Lucas, but it wouldnt hurt....run it in my car to keep the oil pressure light from coming on. thats a mechanics fix btw. I look at it this way its not going to get any better and why spin a bearing and create yourself more problems

Morgan - It sounds to me that your bearings are at the end of their life (too much clearance). You might want to switch to 20W50 for the short term, then start a fund to rebuild the engine.

Hi everyone

Just over the last few trips i have had a couple of problems with my oil pressure in my 83SN

its fine for the half hour or so (40psi) then it drops way of to like 5 at idle and 20 running,

the 1st time i saw it i went straight home checked oil level, was a bit low but nothing to cry home about, so i topped it up (15w40), ran it on a hose for about 15 min and everything was normal! so went out again last night and same again after a while it dropped off, not as far as the 1st time but still under 15 at idle and max of 30, everything sounds normal to me no major leeks (always had 1 small one out of the main end seal)

what do u think could be the issue?

the engine has done 1100 hours so its not in mint condition but it starts first pop every time has heaps of power for what i need and i never run it much over 3500rpm in fact most of the time only about 1800rpm.