Category Archives: Mercedes Benz 300SEL 6.3

300SEL 6.3 progress…

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The engine is now together and just needs tuning , after the heads were checked an the tappets adjusted.

IMG_0314The shroud was derusted ,then painted with POR15 gloss black .

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Mercedes Benz 300 SEL 6.3 cylinder Head swap.

IMG_0253A new fuel line has been fitted using the original brackets etc which were in good condition after 40 years…!

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The engine bay needed a clean and after a wash it was revealed to have a few places where the paint had disappeared  because of engine heat . IMG_0261

With the heads off ,a few little things became apparent such as this feed wire for one of the thermal time Switches. A couple of the firewall grommets needed replacing .Missing grommets allow noise,fumes etc into the cabin .

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The Steering box was leaking through that round part on the top part of the

Steering box . A new seal had to made for this and the two copper washers were missing. the cover nut and lock nut were both loose. The oil return pipe on the steering box has also been damaged in the past when some one bent it.

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IMG_0271With the heads off and the engine due for a repaint ,the booster was removed and rust removed . it was then etch primed and primed. The other objects in the picture belong to the 280SE 3.5 ute project..

The car was completely masked up and the engine bay resprayed in the black satin as before.

BUT before the black could be applied and the engine bay was still in primer one or two other jobs need doing.

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The firewall brace on the left hand side was cracked almost right around and had to be welded up.

With the engine bay now painted the heads were fitted ,along with newly plated relay brackets . There is a lot less wiring now the original loom has been cleaned up and things such as a mobile phone loom removed .

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Mercedes Benz 300SEL 6.3 repairs

IMG_0239OK, ,more progress on the 6.3. The fuel is being replace and this pic shows why. Many years ago someone has crushed it by lifting the car incorrectly with a hoist ,jack or….forklift. In fact it was squashed in many places.

next pic shows one of the other crush points.

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IMG_0242Next job is the Fuel lift pump.

As can be seen in the pic,the pump was mounted solidly and is 150mm too high,meaning that once the fuel level drops to 1/3rd tank level the pump was starting to starve for fuel . These pumps are not a suction pump,but a pressure pump.

6.3 300SEL Service

IMG_0214Little details..

This is the conduit where the vacuum lines for the central locking pass on the 280SE 3.5 Project… pretty neat and an example of the over engineering on Mercedes of the past.

The 6.3 was misfiring badly under acceleration. a big disappointment for the owner ,who had spent a lot of money getting the injection pump rebuilt and the ignition converted to electronic  . So, when working under thecar replacing worn rubber joints and worn drive shaft parts I spotted the squashed fuel line .The picture on the right shows a really bad dent in the main fuel line . The entire line will have to be replaced ,and i am thinking this is probably the cause of the misfire

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The Drive shaft with it’s new staked unijoints and rubber center support bracket .

6.3 major service

IMG_0199Up on the hoist, the steering box coupler has been replaced ,Other jobs required are a new flex disc ,drive shaft universal joints and center support bearings. The diff support pivot bush was worn out so the diff was removed.

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IMG_0202The brake hold down (or anti dive mechanism ) device was stripped and overhauled with new seals and bushes. The shafts were a bit stained from water getting in but otherwise OK.

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The torque arm bushes will be replaced as these look to be the original do nuts and are as hard as rocks.

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IMG_0208a bit hard to see in this shot,but this is a heat sheild uder the drivers foot well,which will be removed and cleaned so it does it’s job properly.

Mercedes 280 SE 3.5 W108.057 with a difference!

I First saw this Car some years ago when the owner wanted an opinion of it , before buying it. In the mean time it was stripped and repainted a gorgeous Moss  green Metallic .  The job ahead of me now is too reassemble it to show standard

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The interior needs a lot of work as it appears to have been sitting at the painters for a very long time.IMG_0044 IMG_0045 IMG_0046 The engine room is scruffy so that is going to be a big job sorting out a locked up engine and redoing all the plating and replacing all the rubber.

IMG_0047 IMG_0049 IMG_0051and i thought i’d try a Borbet wheel for size on my coupe project.

http://en.wikipedia.org/wiki/Mercedes-Benz_W108

Chistmas 2014

Christmas 2014 008 Christmas 2014 007Nothing beats driving a vintage Benz on a long trip.
This year was no exception and I took my 300SEL 6.3 to Gladstone to stay at a relatives and enjoy a bit of seasonal cheer. The car ran great ( except for a blown fuel line which wasted $100 worth of fuel on the road) but I suspect the injection pump ,which I had rebuilt some years ago at great expense ,is running far too lean. how long since exhaust pipes were this color? or are they slipping lead back into high octane fuel?

That’s my 6.3 at Rockhampton where we spent a few hours looking for an RV for a relative.