Ricky Beals Posted September 19, 2022 Share Posted September 19, 2022 I noticed today that my oil pressure in mack rd688 never gets over 30 psi. It usually runs around 20 psi and I’m thinking that’s awful low. It is full of oil, runs fine so maybe my gauge is faulty. What do you guys think? Quote Link to comment https://www.bigmacktrucks.com/topic/70455-oil-pressure-seems-low/ Share on other sites More sharing options...
Onyx610 Posted September 19, 2022 Share Posted September 19, 2022 Hook a gauge into the oil filter housing to start. Come back with your readings and we can go from there. Quote Link to comment https://www.bigmacktrucks.com/topic/70455-oil-pressure-seems-low/#findComment-509801 Share on other sites More sharing options...
Ricky Beals Posted September 20, 2022 Author Share Posted September 20, 2022 Hey Onyx610 you going have to break it down a little more than that. I’m almost positive I have two oil filters plus one that has a centrifugal cartridge. What kind of gauge and where exactly do I hook it up? Quote Link to comment https://www.bigmacktrucks.com/topic/70455-oil-pressure-seems-low/#findComment-509874 Share on other sites More sharing options...
Onyx610 Posted September 20, 2022 Share Posted September 20, 2022 Should be a port above one of the oil filters. Should be plugged. You can take that out and thread in a gauge. Gauge doesn’t have to be anything special. Quote Link to comment https://www.bigmacktrucks.com/topic/70455-oil-pressure-seems-low/#findComment-509875 Share on other sites More sharing options...
Onyx610 Posted September 20, 2022 Share Posted September 20, 2022 I’ll see if I can find a picture Quote Link to comment https://www.bigmacktrucks.com/topic/70455-oil-pressure-seems-low/#findComment-509876 Share on other sites More sharing options...
Joey Mack Posted September 20, 2022 Share Posted September 20, 2022 On top of the oil filter pad is the sensor. You can pull it, install a 't' fitting, put the sensor back in and plugged in then put the gauge in the other port on the 't' and compare readings.. jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70455-oil-pressure-seems-low/#findComment-509877 Share on other sites More sharing options...
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