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| | | | Joined: Apr 2010 Posts: 127 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 127 | Quick question. I have a fresh rebuild on my 235 and I was wondering what the oil pressure should be at operating temperature. I rebuilt it a few years back and it has always ran at about 30 psi when it warmed up while idling. Today was the first time I have got to get it out on the road. It started out the same but after about 20 miles it dropped to probable 20-25 psi at a stop while idling. I'm assuming this is probably fine. After it is shut off for an hour and cools off a bit it goes right back to 30 psi at idle. Also going down the road it runs 45-55 psi at roughly 50 mph. Thanks guys | | | | | Joined: Feb 2004 Posts: 29,888 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,888 | That's an excellent oil pressure, both cold and hot. A lot of the members here would be happy as a clam to have that much pressure. The slight drop at hot idle is due to expansion of parts as they warm up, and thinning of the oil a little as it gets up to operating temperature.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Apr 2010 Posts: 127 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 127 | That's exactly what I thought. The thinning of the oil as it was going down the road. Thanks for the response! | | | | | Joined: Oct 2008 Posts: 310 'Bolter | | 'Bolter Joined: Oct 2008 Posts: 310 | Those are great engines. My '54 235 was rebuilt in '86 and I've put about 65,000 miles on it since then. Don't know what the road speed OP is (my 30 lb gauge in the '46 truck it's in stays pegged), but on a hot day after a run at highway speed I'm running a solid 20 lbs at idle. Frequent oil changes and they'll last and last (don't even have an oil filter on mine).
Last edited by David Bush; 08/21/2014 3:50 PM.
| | | | | Joined: Jan 2008 Posts: 140 Shop Shark | | Shop Shark Joined: Jan 2008 Posts: 140 | Rule of thumb.....at least 10lbs of pressure for every 1000 rpm is fine. | | | | | Joined: Jan 2010 Posts: 378 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 378 | I wish mine had that good oil pressure that you have. | | |
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