acesneights1 Posted April 3, 2016 Share Posted April 3, 2016 I have an M52a1 with this motor and I noticed the oil pressure was lower than usual today. it is very cold out but it is only running about 15-20 psi idle cold and maybe 35 if I race it up. I could swear it had more. The truck overheated pretty good the other day but seems to be running fine now. No oil in the antifreeze and vice versa. No pressure in the cooling system/ Also this truck takes about 10 to 15 seconds to build oil pressure. I wasn't overly concerned as I know that is normal on the M52's Multifuel counter part because of the upside down canister filters. Should that be normal on this truck as well ? Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/ Share on other sites More sharing options...
stuie56 Posted April 3, 2016 Share Posted April 3, 2016 should be over 30 at idel and 60 at 1500 rpm Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329443 Share on other sites More sharing options...
acesneights1 Posted April 3, 2016 Author Share Posted April 3, 2016 : ( So the motor is most likely toast. Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329444 Share on other sites More sharing options...
acesneights1 Posted April 3, 2016 Author Share Posted April 3, 2016 (edited) That is what I was afraid of. I guess she's getting the torch. I don't have money for a motor and I have an M813 with Cummins that needs a cab. I probably damaged it when it overheated...That stinks. Edited April 3, 2016 by acesneights1 Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329445 Share on other sites More sharing options...
acesneights1 Posted April 3, 2016 Author Share Posted April 3, 2016 (edited) It was making like a starving hydraulic pump sound when it was cold but the truck is a Manual. I wonder if that was the oil pump. Edited April 3, 2016 by acesneights1 Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329446 Share on other sites More sharing options...
acesneights1 Posted April 3, 2016 Author Share Posted April 3, 2016 I may have pushed it too hard dragging a trailer back from NY. Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329447 Share on other sites More sharing options...
acesneights1 Posted April 3, 2016 Author Share Posted April 3, 2016 Would a newer Mack motor bolt in place of this one like a 237 or a 300 ? As far as mounts and physical size ? Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329448 Share on other sites More sharing options...
topo Posted April 4, 2016 Share Posted April 4, 2016 With the parts on your engine now changing to a 675 or 676 it should work the injector lines may interfere with the water manifold your 673 has the line come in from the side and the other engines they come in from the top. in the truck you don't have much space between the hood and thermostat housing . Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329458 Share on other sites More sharing options...
acesneights1 Posted April 5, 2016 Author Share Posted April 5, 2016 Like most old Military trucks, it has ground issues. gauge is at fault. There is a test port on the turbo feed line. 55 psi luke warm idle. Quote Link to comment https://www.bigmacktrucks.com/topic/44641-what-is-normal-oil-pressure-on-an-endt-673/#findComment-329606 Share on other sites More sharing options...
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