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#33930 01/02/2005 3:23 AM | Joined: Aug 2004 Posts: 242 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 242 | Hello fellow bolters;
Fired up the the rebuilt '55 235 today and everything was fine until I noticed that the oil pressure only went to 20 psi, then down to 10 psi back to 20 psi and then settled in at 5 psi at idle, my book syas I should have 35 psi, increasing engine speed did not change the reading, still stayed at 5 psi. Everything in the Engine is new and Oil pressure gauge was checked and is functioning properly. My guess is the pressure relief valve might be stuck on the pump. Any ideas?
Thanks
1942 G5106 1.5-ton Chevy cargo dump Gallery pageOld Dominion Stovebolt Society T/Sgt. Gott (28 years of service with the USPP) 1940 Chevy G506 4112 cargo dump 1942 Diamond T G509 969A 4 ton wrecker 1942 Ward LaFrance G116 series 2 10 ton wrecker 1944 Ward LaFrance G116 series 5 10 ton wrecker 1931 Ford AA with a WEAVER crane 1944 Sterling HC 165 tractor 1944 Autocar U7144T w/ 10 ton trailer
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#33931 01/02/2005 4:48 AM | Joined: Oct 2003 Posts: 124 Member | | Member Joined: Oct 2003 Posts: 124 | I had a stuck pressure relief valve on my 54 and it made the pressure WAY too high until warmed up.
One thing to consider is to try a new, generic pressure guage to double-check. | | |
#33932 01/02/2005 2:22 PM | Joined: Aug 2004 Posts: 242 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 242 | I tried 2 seperate oil pressure gauges with the same results. I guess I will be dropping teh pan today to take a look. 
1942 G5106 1.5-ton Chevy cargo dump Gallery pageOld Dominion Stovebolt Society T/Sgt. Gott (28 years of service with the USPP) 1940 Chevy G506 4112 cargo dump 1942 Diamond T G509 969A 4 ton wrecker 1942 Ward LaFrance G116 series 2 10 ton wrecker 1944 Ward LaFrance G116 series 5 10 ton wrecker 1931 Ford AA with a WEAVER crane 1944 Sterling HC 165 tractor 1944 Autocar U7144T w/ 10 ton trailer
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#33933 01/03/2005 7:27 AM | Joined: Aug 2004 Posts: 196 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 196 | drain the oil put a straight 30 wt. try it first | | |
#33934 01/04/2005 2:41 AM | Joined: Jul 2003 Posts: 101 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2003 Posts: 101 | Be aware some of the old motors required certain restrictions in their oil lines to maintain pressure. I had a similar problem with a 1953 302 GMC straight 6. After the rebuild it had various sized copper tubing and rubber hose here and there for oil line and the pressure seemed a little marginal. I had the tubing replace with factory spec size tubing and the oil pressure increased significantly. There have been a few threads on this in the past you could search for. | | |
#33935 01/04/2005 5:07 AM | Joined: Aug 2000 Posts: 197 Member | | Member Joined: Aug 2000 Posts: 197 | Izzenhood: There is an orifice that screws into the head of the gmc engines to restrict oil to the rocker arm. Was this left out?
Jason
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#33936 01/04/2005 7:13 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Did you try to put a spin-on or full flow filter on instead of a bypass filter and leave out the restrictor oriface? If you left the oiling system stock plug off the filter holes with bolts and see if that fixes it, if so, add a restrictor on the outlet of the oil filter. It just drains back into the pan.
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