oil/temp/fuel level gauge from petrol in a diesel engine?

1976-1985: 230T, 230E, 230TE, 230CE, 280E, 280TE, 280CE, 240D, 300D, 300CD, 300TD,
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JoergMel
Dernburg Wagon
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Joined: Wed 29 May, 2019 10:37 pm
Model you own: w123
Region: Victoria
Location: Melbourne

oil/temp/fuel level gauge from petrol in a diesel engine?

Post by JoergMel » Thu 30 May, 2019 9:19 am

Hi,

I am new here and sorry if this has been posted before. I have a W123 1983 300D and my gauge with the oil pressure, temperature and fuel level does not really work anymore.
So I talked to some of the wreckers around here. They do have some but only out of a 280E or 230E petrol models.
Are the gauges across the model compatible or do I need to get one out of a 240D/300D as well?

Thanks for any input.

Joerg

CraigB
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by CraigB » Thu 30 May, 2019 11:56 am

I don't know for sure but would think it is the same. Fuel guage would have same electrical input. Just check the others are the same. You could test yours though - seems odd to me that all have stopped working and perhaps there is a fuse or voltage stabiliser or earth or something relative to all three. Lots of 123 people and hopefully one can help more
Craig Baulderstone
280s's
280SE3.5
280SL Ruby
300TE Otto
350SL Gloria
350SLC Lurch
450SEL Boris
500SEC's...including Syd
560SEL's Foufou and Zac

mathuisella
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by mathuisella » Thu 30 May, 2019 12:56 pm

Fuel gauge is the same, as it's just a liquid level sensing float resistance circuit.

oil pressure is just 0 to 45 psi from the engine, just make sure it's connected properly.

the same with temp sensor, make sure it's connected to the appropriate place, different engine, but it's still a temperature probe that's in the engine block. Connect the line between it and the gauge and you're good. :)

tsharkey
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by tsharkey » Thu 30 May, 2019 6:15 pm

Plug and play if they are both from post 79 models.
W123 1981 300TD - Family Kid mover
W202 1998 C250D Factory OM605A Turbo - Partner's daily driver
W123 1982 300CD Retro fitted OM617A Turbo - Mine
W123 1984 300TD English 5 Speed Manual
W123 1982 300TD Factory OM617A Turbo (Hans) - Project
W123 1982 300D - OM617 NA (Hektor) - Son's
W123 1985 230TE - Brother's
W123 1985 300D - Sister in Law's
1962 S-Series Valiant (Tho Daimler & Chrysler divorced, still part of the extended family)

Past benzes
W114 1969 250CE - PO put in an M110 transplant and nearly sent me around the bend
W123 1981 300TD - "Matilda" - RIP hit front side & rear but left my brother + niece A-OK

Current Projects
Coupe restoration, Turbo Wagon freshen up

JoergMel
Dernburg Wagon
Posts: 6
Joined: Wed 29 May, 2019 10:37 pm
Model you own: w123
Region: Victoria
Location: Melbourne

Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by JoergMel » Thu 30 May, 2019 8:28 pm

Great, thanks a lot to all for the swift reply.

Henry Schuman
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by Henry Schuman » Fri 31 May, 2019 1:31 am

First thing I would check is the Fuse since all those units are not working and actually pull the fuse to inspect it or run a continuity check as they get corroded and fail too.
Don't Squat With Your Spurs On !!!!

JoergMel
Dernburg Wagon
Posts: 6
Joined: Wed 29 May, 2019 10:37 pm
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Region: Victoria
Location: Melbourne

Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by JoergMel » Sun 02 Jun, 2019 12:30 am

Good point. Actually the gauges are not really gone but jump around and are failing for a couple of seconds just to work normal or jump around again. I checked a bit more and it looks that I can potentially rebuild them, rather buying another.

CraigB
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by CraigB » Sun 02 Jun, 2019 12:42 pm

You didn't mention that before - if they are all jumping at the same time, I wouldn't be looking at the gauges but getting a multimeter and checking current feeding the instruments.
Craig Baulderstone
280s's
280SE3.5
280SL Ruby
300TE Otto
350SL Gloria
350SLC Lurch
450SEL Boris
500SEC's...including Syd
560SEL's Foufou and Zac

mathuisella
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Location: Brisbane, North side.

Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by mathuisella » Mon 03 Jun, 2019 12:38 am

CraigB wrote:
Sun 02 Jun, 2019 12:42 pm
You didn't mention that before - if they are all jumping at the same time, I wouldn't be looking at the gauges but getting a multimeter and checking current feeding the instruments.

Probably a bad ground connectionas per the 2 bolts that connect it to the rest of the cluster which the ground line goes through, so vibrations ect:

If your cluster screws are loose and tightening them doesn't work. I suggest filling up/rebuilding the screw holes with plastic welding, redrilling and tapping the holes again :) Takes a while, but it's possible as i done it on my last car :)

JoergMel
Dernburg Wagon
Posts: 6
Joined: Wed 29 May, 2019 10:37 pm
Model you own: w123
Region: Victoria
Location: Melbourne

Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by JoergMel » Mon 03 Jun, 2019 11:03 am

Sorry for the confusion. I thought initially that the gauges are gone for good. After I posted the message I was looking further and then found by accident a post (I think it was even here) that you can rebuild those gauges. I was not able to search directly on this forum since my search ability is still blocked (don't know why, guess because I am a new member?) but had to go thru google. I will check these things and let you know how it went. At the moment the priority is to get all done to pass the roadworthy test.

mathuisella
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by mathuisella » Thu 13 Jun, 2019 12:49 am

JoergMel wrote:
Sun 02 Jun, 2019 12:30 am
Good point. Actually the gauges are not really gone but jump around and are failing for a couple of seconds just to work normal or jump around again. I checked a bit more and it looks that I can potentially rebuild them, rather buying another.
Does the speedometer have a jump needle ?

If so, replace the cable :) and lubricate the ends with some good grease.

I had a square ended speedo cable, however, my gearbox wanted more of a "spade" connection, so it was just spinning and barely gripping the small square wire and thus it wouldn't work very well and the needle on the dashboard would bounce a bit.

got another space connection cable and it's been perfect ever since.

CraigB
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by CraigB » Thu 13 Jun, 2019 1:49 pm

i second that one - Always been the cable for me when the needle does funny things.
Craig Baulderstone
280s's
280SE3.5
280SL Ruby
300TE Otto
350SL Gloria
350SLC Lurch
450SEL Boris
500SEC's...including Syd
560SEL's Foufou and Zac

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Bartman4800
300 SLR
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by Bartman4800 » Thu 13 Jun, 2019 4:56 pm

Alternatively there can be dirt between the spinning magnet wheel and the housing of the speedo.

A bit of a clean-out with pressurized air (be careful though) can do wonders, following by a lubrication of the magnet wheel bearing with some light oil.


Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

tsharkey
Große
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Re: oil/temp/fuel level gauge from petrol in a diesel engine?

Post by tsharkey » Thu 13 Jun, 2019 7:11 pm

CraigB wrote:
Thu 13 Jun, 2019 1:49 pm
i second that one - Always been the cable for me when the needle does funny things.
+1

Another sign of a cable needing grease is a whine that comes and goes when speeding up - cadence not related to engine speed but definitely the speed of the car ....
W123 1981 300TD - Family Kid mover
W202 1998 C250D Factory OM605A Turbo - Partner's daily driver
W123 1982 300CD Retro fitted OM617A Turbo - Mine
W123 1984 300TD English 5 Speed Manual
W123 1982 300TD Factory OM617A Turbo (Hans) - Project
W123 1982 300D - OM617 NA (Hektor) - Son's
W123 1985 230TE - Brother's
W123 1985 300D - Sister in Law's
1962 S-Series Valiant (Tho Daimler & Chrysler divorced, still part of the extended family)

Past benzes
W114 1969 250CE - PO put in an M110 transplant and nearly sent me around the bend
W123 1981 300TD - "Matilda" - RIP hit front side & rear but left my brother + niece A-OK

Current Projects
Coupe restoration, Turbo Wagon freshen up

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