Dieseldriver65 Posted August 24, 2015 Share Posted August 24, 2015 Looked at a B61 with a natural 673.Engine runs great but hot only has 10/12 lbs of oil pressure at idle.Oil has not been changed in many years as it was sitting.Worse case are bottom end bearings available for 673's? Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/ Share on other sites More sharing options...
terry Posted August 24, 2015 Share Posted August 24, 2015 Have seen many with kind of pressure at an idle run for years,what does it come up to when driving down the road? Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301244 Share on other sites More sharing options...
j hancock Posted August 24, 2015 Share Posted August 24, 2015 Bearings are available from various sources. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301246 Share on other sites More sharing options...
Dieseldriver65 Posted August 24, 2015 Author Share Posted August 24, 2015 Have seen many with kind of pressure at an idle run for years,what does it come up to when driving down the road?25-30 driving down the road in the upper rpm's Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301247 Share on other sites More sharing options...
Bigdogtrucker Posted August 24, 2015 Share Posted August 24, 2015 My engine has similar pressure but runs like a Rolex! Just bought oil/filter as mine is LONG overdue for a change...Thinking about getting some Lucas also. My engine doesn't have a lot of miles on the overhaul, but it was 20? years ago when it was done. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301299 Share on other sites More sharing options...
terry Posted August 24, 2015 Share Posted August 24, 2015 Could be a weak relief spring in the oil pump Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301360 Share on other sites More sharing options...
theakerstwo Posted August 25, 2015 Share Posted August 25, 2015 Or scored relieve plunger in the pump.It would help if you told us what oil filter it has.A photo would help of the left side of the engine.does the oil filter have two oil lines or three lines? Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301386 Share on other sites More sharing options...
Dieseldriver65 Posted August 25, 2015 Author Share Posted August 25, 2015 Didn't get any pics and the truck sold,wish i'd have jumped on it was a good deal.Bigdog feel free to post a few pictures of your set up if these guys can help. Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301431 Share on other sites More sharing options...
Bigdogtrucker Posted August 25, 2015 Share Posted August 25, 2015 Thanks DD65-My truck has a two line system, is this by-pass or full flow?(1960 END673) Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301449 Share on other sites More sharing options...
Superdog Posted August 25, 2015 Share Posted August 25, 2015 that's a by pass,the full flow was the taller one with bigger lines 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301466 Share on other sites More sharing options...
41chevy Posted August 25, 2015 Share Posted August 25, 2015 Whats the pressure with fresh oil and filter?I'd do that first before you assume there trouble. Paul 1 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301479 Share on other sites More sharing options...
Maddog13407 Posted August 25, 2015 Share Posted August 25, 2015 yup, taller ones with about 1'' lines is the full flow. if its low on oil pressure might wanna check the air compressor. if it takes forever to build air its junk and is acting like an oil pump, takin down the oil pressure and pumping the oil right into the air tank Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301480 Share on other sites More sharing options...
theakerstwo Posted August 26, 2015 Share Posted August 26, 2015 The two line by/pass oil filter engine should have a oil pan with a screen in the bottom that can stop up and hold the pressure down.The screen can be pulled out thru the bottom thru a removeable cover about 8" in dia. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301504 Share on other sites More sharing options...
Bigdogtrucker Posted August 26, 2015 Share Posted August 26, 2015 The two line by/pass oil filter engine should have a oil pan with a screen in the bottom that can stop up and hold the pressure down.The screen can be pulled out thru the bottom thru a removeable cover about 8" in dia.Yes I have that pan. I need to clean that and change my oil before anything else. Quote Link to comment https://www.bigmacktrucks.com/topic/41478-673-oil-pressure/#findComment-301512 Share on other sites More sharing options...
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