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Old 03-26-2017, 10:42 AM   #1
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Oil pressure

Cranked up the 4.108 this morning before heading out. I had just put about a quart of oil. The oil pressure gauge when idle will show about 40 lbs. Whoi speed up oil gauge dropped to 0 and jumping No low pressure because alarm not going off. Alarm works. After about 30 minutes gauge showing between 20 an 30. Do you think my gauge just went bad
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Old 03-26-2017, 10:51 AM   #2
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More likely the sender at the engine.
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Old 03-26-2017, 11:00 AM   #3
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Greetings,
Mr. captb. Could well be the sender but check all your electrical connections first. Might just as easily be something loose AND it won't cost you anything.
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Old 03-26-2017, 12:29 PM   #4
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Thanks guys. After about an hour it leveled out at 60 and quit jumping
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Old 03-26-2017, 05:07 PM   #5
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Senders are wear items. More likely to fail than the gauge.
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Old 03-27-2017, 01:54 PM   #6
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Quote:
Originally Posted by captbuddy View Post
Cranked up the 4.108 this morning before heading out. I had just put about a quart of oil. The oil pressure gauge when idle will show about 40 lbs. Whoi speed up oil gauge dropped to 0 and jumping No low pressure because alarm not going off. Alarm works. After about 30 minutes gauge showing between 20 an 30. Do you think my gauge just went bad
Very common way that a pressure sender fails - it has a "bad spot". I have had this exact type of failure myself. Best way to verify is to take out the sender and install a mechanical gauge.

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Old 03-27-2017, 03:45 PM   #7
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If other electrical checking doesn't find the fault, check the ground.
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Old 03-27-2017, 03:56 PM   #8
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Greetings,
Mr. k. Checking the ground is always a good thing but the body of the sending unit should be the ground to the block.
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Old 03-27-2017, 04:56 PM   #9
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Another thing that happens, a piece of dirt lodges in the oil pressure valve and keeps it from closing. It's usually part of the oil pump and is there to keep any overly high pressure oil from blowing past the oil seals. The dirt usually clears itself.
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Old 03-28-2017, 02:12 PM   #10
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Guys. Can you tell me where the sender unit is located on the 4.108. Thanks. Anyone know where I can get a sender unit in St Petersburg Fl
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Old 04-09-2017, 10:45 PM   #11
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Just wanted to say thanks to all for your help. Put a new sender unit on today. That solved my problem. Thanks again.
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Old 04-10-2017, 05:57 AM   #12
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Anyone know where I can get a sender unit in St Petersburg Fl

Take it with you to most any auto supply.
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