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#1
04-27-2013, 02:40 AM
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jumping oil pressure
the other day i was sitting in a drive through and my car got up to about 100-105c, in need of a coolant flush, and i noticed that my oil pressure gauge was jumping up and down pretty fast. i was wondering if this means its going out or that my oil pressure is really jumping around. this is a mechanical gauge btw.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 
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#2
04-27-2013, 07:33 AM
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Quote:
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#3
04-27-2013, 09:15 AM
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Well, I'd ask how much was it jumping and how often....was it like a vibration or an erratic heart beat?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
04-27-2013, 12:44 PM
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You 84 300SD I believe has an Electronic Oil Pressure Gauge. If so the Sending Unit will be at the bottom rear of the Oil filter Housing. A fluctuating Gauge could be a symptom of a loose connection at the Sending Unit or a Sending Unit going bad. It could actually be the Sending Unit and the Gauge are working OK and you are really having an Oil Pressure issue. If Oil Pressure issue is happening at Idle it could be the two 6mmIDx10mmODx2mmW O-rings at the bottom of the Oil Filter Tube need to be changes or something is trapped in the Spring loaded Valve inside of that Tube and keeping the Valve open. Compress Air can be blown through the little hole at the top of the Oil Filter Cap Tube to try to blow out anything in the Valve at the bottom of the Tube. The O-rings can simply be replaced. When you have Oil Pressure issues the ideal thing to have would be a Test Gauge that you can hook up to verify what the Oil Pressure really is. But, you need to fabricate the set up for that. Also the Oil Pressure on your Engine has the possiblity of being as high as 110 psi.
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84 300D, 82 Volvo 244Gl Diesel
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#5
04-27-2013, 02:22 PM
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It could mean you have a grounding problem. I added a ground from one of the fasteners that hold the three sections of the instrument cluster together which fixed my "jumpy gauge" problem.
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 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#6
04-28-2013, 01:00 AM
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It's a 300sd motor in a 1985 300d someone made my tag that and I don't know how to change it. I think it's the motor shaking because it doesn't do it unless she's shaking from my low idle.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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#7
04-28-2013, 12:02 PM
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When the page opens up at the far left upper Corner is "User CP"; click on that and on the left of the page is a Menue with various choices.
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84 300D, 82 Volvo 244Gl Diesel
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