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Oil Filter problem 20 Jul 2021 09:12 #223642

  • cliffo
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Did some work on Mack motor requiring removal of oil filter housing so fitted new filters. On startup oil pressure stayed at 30psi regardless of revs where normally 60psi at idle and 75psi with a few revs (cold). Took off Donaldson and replaced with same. Long story short as a last resort fitted new filters and all back to normal. Can anyone explain?

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Oil Filter problem 20 Jul 2021 10:20 #223645

  • Kav
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What model Mack motor Cliffo?

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Oil Filter problem 20 Jul 2021 10:23 #223646

  • cliffo
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237 maxidyne

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Oil Filter problem 20 Jul 2021 16:31 #223656

  • cobbadog
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A bit of gasket flaked off and blocked the gallery?
Cheers Cobba & Cobbarette
Coopernook, The Centre of our Universe.
STUBBOURN B@ST@RD

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Oil Filter problem 20 Jul 2021 16:56 #223657

  • Mrsmackpaul
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Developed a air lock ?
Is there a bypass valve in the filter housing, may have stuck open for some reason


Paul
Your better to die trying than live on your knees begging

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Oil Filter problem 20 Jul 2021 17:20 #223659

  • Kav
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I haven't worked on that part for years but I sort of remember two things which dropped the oil pressure. The first one was a blocked oil filter or the wrong filter which limited the flow and bypassed in the valve over the filters. The other thing was the valve which limits the oil to the piston coolers when it's idling. If it was to stick open, the oil pressure may be affected. Just a couple of suggestions. Kav.

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