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Cat Man
Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
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Experience:  23 Years Caterpillar Engine experience.
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Psi..c7..the oil pump is going bad. is it possible for the oil pump

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I have very low psi on a cat c7 engine. I believe the oil pump is going bad. is it possible for the oil pump to go bad and the hui pump still work well enough to start the engine?
Hi. Thanks for using JA! I will try and help you out.

Yes it is possible. The minimum low idle engine oil pressure spec is 6 psi. That is all the oil pressure needed for the HEUI pump to operate.

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