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Oil suddenly hot, and pressure low
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Bilscho
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PostPosted: Wed Apr 20, 2016 10:29 am    Post subject: Oil suddenly hot, and pressure low Reply with quote

have just built a standard 1500 sp which had been running great with good oil pressure and low temp. Got about 120 miles on the clock and, on a short run out today, about 5 miles, all of a sudden the temp started to rise, and the pressure fall. No unusual mechanical noises, just the gauges and the hot oil smell.

Temp got up to about 110c and oil pressure below 14psi at 30mph, not good.
Ideas really appreciated, thanks
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miniman82
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PostPosted: Wed Apr 20, 2016 12:01 pm    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

Single relief case?
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Max Welton
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PostPosted: Wed Apr 20, 2016 4:28 pm    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

Anything else different about today? Like ambient air temp or sustained speed?

Max
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vwracerdave
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PostPosted: Wed Apr 20, 2016 8:37 pm    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

Many years ago Gene Berg discovered that on early Bus that how many side windows you have open or closed effects the airflow to the side engine vents and causes the engine temps to change. Do a test with all the windows rolled up then repeat the same test with all the windows rolled down.
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stanovich
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PostPosted: Wed Apr 20, 2016 9:30 pm    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

check for a stuck relief valve, slightly open will cause the oil to heat and the pressure to drop. check for dirt in the system when you drain the oil and let us know what you find
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busdaddy
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PostPosted: Wed Apr 20, 2016 10:01 pm    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

Not a bad idea to look in the fan as well for a rag or plastic bag. (engine stopped of course)
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Bilscho
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PostPosted: Thu Apr 21, 2016 12:38 am    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

Thanks for all ideas, it turned out to be rag in the fan, no idea where that came from!! So top marks to busdaddy.
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fastfil
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PostPosted: Thu Apr 21, 2016 1:07 am    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

Props to the acid snail! Shocked
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busdaddy
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PostPosted: Thu Apr 21, 2016 7:04 am    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

I'm lazy so I always try the simple stuff first Wink

Good to hear it's solved.
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theDrew
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PostPosted: Thu Apr 21, 2016 9:48 am    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

respect the fan! I've found the strangest things sucked up by that thing
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SBD
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PostPosted: Fri Apr 22, 2016 6:07 am    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

fastfil wrote:
Props to the acid snail! Shocked
That's not an acid snail, that's GARY! Eh?
Cool
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LocoPedro
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PostPosted: Wed May 25, 2016 12:03 pm    Post subject: Re: Oil suddenly hot, and pressure low Reply with quote

FWIW...
I recently had a similar problem with regards to oil temps and pressure.

As I started diagnosing the relief valve (single relief case) I noticed the return spring was getting caught on an edge in right at the piston open position, causing my pressure and oil temp problems.

I noticed that my spring was flat at the top and had sharp edges so I rounded them out a bit and reduced the diameter of last spiral, which made it spring back without a problem.

Seems to be working so far...

Anyway I thought I would share in case anyone else encounters the same issue.
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