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  #1  
Old 08-17-2015, 06:22 AM
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W114 gearbox, how to top up oil?

Just happen to be 1400 km from home in a different country with limited internet and I think I have a gearbox issue.

W114 ambulance, has had a 300D motor installed, so possibly a non original gearbox, four speed manual.

It has developed a grinding noise when revving low, in first and second gear. Once the revs are up, back to normality.

Could this be a symptom of low gearbox oil, it does leak oil a little from somewhere ?

And, haven't been able to find with slow searching on the internet, how does one top up the oil, I've located what looks like a 17mm or so hexangular "alan key", bolt half way up the side of the gearbox, would that be the one ? No sign of a dipstick.

Thanks in advance
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  #2  
Old 08-17-2015, 06:48 AM
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i did this once, so i can't remember where the filler is, but that sounds right. open up the cap, squeeze oil in until it runs out. that cap is at the correct level.
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  #3  
Old 08-17-2015, 06:49 AM
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by the way.... sounds like a nice bit of history. any pics?
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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

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  #4  
Old 08-17-2015, 06:53 AM
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Quote:
Originally Posted by skalie View Post
...
And, haven't been able to find with slow searching on the internet, how does one top up the oil, I've located what looks like a 17mm or so hexangular "alan key", bolt half way up the side of the gearbox, would that be the one ? No sign of a dipstick.

Thanks in advance
It will probably be a 14mm hex but yes - that's most likely the one you want.

Fill to spill

Though I'd go for a drain and fill with Kroon DEXRON II if I were you.

Drain - same size Allen head screw but on the underside.

Make sure the fill comes out first before you drain though!
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Last edited by Stretch; 08-24-2015 at 07:04 AM. Reason: Wrong size
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Old 08-17-2015, 08:15 AM
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Quote:
Originally Posted by Wodnek View Post
by the way.... sounds like a nice bit of history. any pics?
Tried uploading one, but would probably take two weeks to upload with this internet connection, will get some onboard when back home.
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306D 1975 (camper) - rusting away
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  #6  
Old 08-17-2015, 09:22 AM
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Quote:
Originally Posted by Stretch View Post
Make sure the fill comes out first before you drain though!
+1 on this!

It's an aggravating job refilling the differential using a syringe and flexible tubing through the vent.
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  #7  
Old 08-24-2015, 05:35 AM
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Quote:
Originally Posted by Stretch View Post
It will probably be a 19mm hex but yes - that's most likely the one you want.

Fill to spill

Though I'd go for a drain and fill with Kroon DEXRON II if I were you.

Drain - same size Allen head screw but on the underside.

Make sure the fill comes out first before you drain though!
..... due to being on a campsite with limited resources, I'd prefer to top up for now and do a fresh change when I get back to my workspace.

Wouldn't want to make a mess here, which would probably happen, no ramps / pit / bridge.

However next issue; there are various schools of thought on here and elsewhere as what gearbox oil I should use, DEXTRON being ATF. Having no idea what oil is in the thing would DEXTRON be compatible with, say, the old fashioned type oils they used to use ?

I'm thinking about the incompatibilty of synthetic and mineral engine oils, to name an example.
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306D 1975 (camper) - rusting away
W116 450 SEL 1975 - sold
W114 long wheelbase ambulance, 3 litre diesel 1974

VW Golf 1 convertable - midlife crisis item
VW T4 van - support vehicle
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  #8  
Old 08-24-2015, 07:07 AM
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Quote:
Originally Posted by skalie View Post
..... due to being on a campsite with limited resources, I'd prefer to top up for now and do a fresh change when I get back to my workspace.

Wouldn't want to make a mess here, which would probably happen, no ramps / pit / bridge.

However next issue; there are various schools of thought on here and elsewhere as what gearbox oil I should use, DEXTRON being ATF. Having no idea what oil is in the thing would DEXTRON be compatible with, say, the old fashioned type oils they used to use ?

I'm thinking about the incompatibilty of synthetic and mineral engine oils, to name an example.
Scrub the 19mm - it should be 14mm

The original oil in the gearbox should be DEXRON ATF in any case.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #9  
Old 08-24-2015, 09:27 AM
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Thanks Stretch, seems that Dextron is backward compatible, so full of confidence.
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306D 1975 (camper) - rusting away
W116 450 SEL 1975 - sold
W114 long wheelbase ambulance, 3 litre diesel 1974

VW Golf 1 convertable - midlife crisis item
VW T4 van - support vehicle
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  #10  
Old 10-05-2015, 01:25 PM
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Quote:
Originally Posted by Wodnek View Post
by the way.... sounds like a nice bit of history. any pics?
Better late than never.
Attached Thumbnails
W114 gearbox, how to top up oil?-alley114.jpg  
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306D 1975 (camper) - rusting away
W116 450 SEL 1975 - sold
W114 long wheelbase ambulance, 3 litre diesel 1974

VW Golf 1 convertable - midlife crisis item
VW T4 van - support vehicle
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  #11  
Old 10-07-2015, 04:54 AM
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Do you always park in a dungeon?

Is this just in keeping with the hearse look?
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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