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Restoration & Repair Tips Board

High oil pressure

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Author  [Modern View]

03-19-2014 13:50:21

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Just fired up my Perkins A4.318 diesel after a complete rebuild- it was my first.
It started up great, but the oil pressure was in the high "yellow" range on the gauge (i.e. higher than the "green" range. Sorry no pressure quantity, just using the MF gauge in the dash.
I shut it down to think about it. I am guessing it is just from new bearings. Am I correct?

I have 10W30 with a bottle of the Lucas Zinc additive in the oil pan.

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03-20-2014 05:29:13

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 Re: High oil pressure in reply to ecar, 03-19-2014 13:50:21  
I agree with Stonessmalleng. Put a gauge on it. I never trust a dash gauge for diagnostics. A known good pressure gauge should tell you what you need to know. Post results if unclear.

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03-19-2014 18:17:32

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 Re: High oil pressure in reply to ecar, 03-19-2014 13:50:21  
New bearings, properly sized, should cause an increase in oil pressure but is should stay in the green band. Relief valve could be stuck closed. Did you replace the oil pump?

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03-20-2014 03:55:21

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 Re: High oil pressure in reply to JerryMT, 03-19-2014 18:17:32  
no- didn't replace the counter balance/oil pump assembly. I cleaned it thoroughly and it look to be in good working order. It didn't even cross my mind to take it further apart (I probably should have).
From the parts breakdown I see the relief valve is in the oil pump assembly.
I only let it run for a few minutes, I wonder if I should let it run a few more to see if the pressure drops.

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03-22-2014 20:10:35

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 Re: High oil pressure in reply to ecar, 03-20-2014 03:55:21  
Generally speaking, low oil pressure is worse than high oil pressure.

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03-19-2014 16:52:00

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 Re: High oil pressure in reply to ecar, 03-19-2014 13:50:21  
If it was me I would install a reg gauge. To see what the psi is. 50 lbs to 60 lbs ?????
Then you will know what your dash gauges is saying. In that color. My 2 cents.

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