oil pressure relief valve- '65 HD3 Allis

Forum,
Is there a least intrusive method to release a possible stuck oil pressure relief valve? For the past five years of owning this particular crawler the oil pressure has pegged to the right even when running at normal temps. I am using 15-40 weight diesel oil. Just received a pdf of the operators manual and it states the needle should be centered not buried to the right. To this point I have had no issues with operation of the crawler. Any and all thoughts are welcome.
 
(quoted from post at 22:02:24 08/13/22) Forum,
Is there a least intrusive method to release a possible stuck oil pressure relief valve? For the past five years of owning this particular crawler the oil pressure has pegged to the right even when running at normal temps. I am using 15-40 weight diesel oil. Just received a pdf of the operators manual and it states the needle should be centered not buried to the right. To this point I have had no issues with operation of the crawler. Any and all thoughts are welcome.

Have you checked the oil pressure with a known gauge, having a reading in pounds, to see what it reads in pounds? Your existing gauge may be out of calibration for the range.
 
Thanks for the reply. That is a good point being this is a 1965 Allis. I will get
a new pressure gauge and check out the line's route to the block. One more question, is it typical for the gauge to read pressure before the engine has started? Seems to read
pressure immediately! Thanks again.
 
What pressure range in PSI should the engine have? Maybe buy a gauge that covers that range and attach it with a hose to see what it reads.
 
One more question, is it typical for the gauge to read pressure before the engine has started?

No, the gauges normally lag behind engine start as the engine has to build pressure, it not instant.
 
Thanks again for the replies. To be more specific, when the engine is not running it reads zero. When I start turning it over it climbs??? Where do I attach a hose to connect to a good oil gauge? Point of interest, there was only one time the oil gauge fluttered at the high end when I was working it in summer temperatures. The reason I am a little tentative is several years I burnt up a diesel engine because of lack of oil pressure. It was a totally different situation. Thank again for the info. Will keep you posted. Plan to head to NE Minnesota within two weeks to do final touches on the HD3 and plant clover for the deer.
 

Unhook the existing gauge from the block and hook the test gauge in the same spot. If it is climbing from zero while cranking, that is ok if all is tight, and the pump is good. It is also a function of how long the line is, short line should show pressure quicker than a long line would.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top