6.9 engine rebuild with pics

[s class]

Those heads really do look good, your engine does appear to have been in very well looked after condition.

[nathan]

Cheers S,
TJ - they are the euro pistons. I noted a little chip on that one on the non combustion side. not sure where that came from!
anyway, the boss will get onto cleaning it all up and putting it back together.
I should be able to pick up the ceramic coated exhaust manifolds this week.

[nathan]

few more parts arriving today. these were mainly for the driveshaft support and bearing.

[marku]

Expansion tank

Nathan - is that the part no for the tank in your photo? 126 500 15 49 gets me something very different and 116 500 02 49 (original part no) does as well. Lots of people advertising the second for the 116 but it wont fit. Suppose I will have to go direct to MB. Would really like to replace my old yellowed tank with one like yours.

[TJ 450]

Nice new parts... It should be nice and smooth with the tail shaft refurb.

BTW, I'm using my iPhone and can't review the pics atm, but were you getting/did you get new engine/trans mounts? I've heard that 6.9 engine mounts are NLA, but these rumours tend to be a little unreliable these days.

Tim

[nathan]

Marku, the expansion tank is that 126 part as you say. the only difference I'm aware of from the original is it has a sensor hole at the bottom for the fluid level but you can just plug this. it wasn't expensive anyway!

TJ, I got new mounts. we had these from a while ago.  I agree, you hear a lot of NLA but either times must change or people ask the wrong people!

[marku]

But the 126 expansion tank bottom hose connection is far to big for the 116 hose. Yes you can block the sensor connector - you can get a kit - but it is not right and all the people selling the tank should stop saying it will fit the 116.

[s class]

The footnote associated with the reservoir advises that additionally the 126 type hose needs to be used.  I've done this on numerous 116s with good results.  I would never trust the brittle old original 116 reservoir.

[UTn_boy]

Oh don't be fooled fellas.  The motor mounts are no longer available.  No rumor.  Fact.

[TJ 450]

Yes, I used a 126 hose and cut the end off it so it fitted down the radiator end. There are two versions of 116 hose though, later tanks have a larger diameter... I never confirmed if this was the same as the W126 version, and it may well have been an earlier 126 upgrade, not sure on that.

With the engine mounts, if they are NLA lucky we have spares then. I bought some new old stock ones off eBay a while back. Worst case you could probably use M117 ones but they might not be up to the task of supporting the M100.

Tim

[rumb]

I used a rein motor mount 123-241-14-13

[UTn_boy]

As long as the M-117 mounts are for a cast iron block M-117 they'll work just fine.  The 6.9 doesn't weigh that much more than an M-117 with a cast iron block.

[marku]

The footnote associated with the reservoir advises that additionally the 126 type hose needs to be used.  I've done this on numerous 116s with good results.  I would never trust the brittle old original 116 reservoir.

But surely the 126 hose will be too big for the 116 radiator.

[TJ 450]

Hi Marku,

With the 126 hose,

It's the same diameter at the radiator end from memory, it's just at the expansion tank end where it increases in diameter.

Tim

[marku]

OK thanks for that.