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#1
Mechanicals / Re: W116 6.9 (6632) engine reb...
Last post by HPC - Today at 06:44 AM
Running rich can be due to the last 8 years just starting the engine occasionally with fresh oil and no coolant to keep it going. The PO did mention having to do some work on the fuel system at some point due to not running well.

Considering the amount of wear... continue with a full rebuild (with some parts NLA), or stop here and look for a good running motor? Even if I can get the heads all new, you can't ignore the block.

I have sourced some parts for the motor already, but these may be better used on a motor in a better condition to start with.
#2
Mechanicals / Re: W116 6.9 (6632) engine reb...
Last post by Randys01 - Today at 02:09 AM
I have a theory about this motor. I'm just puttin' it out there.
After peering into these photos for some time and taking into account what has been reported I am hily suspicious that this motor has spent a lot lot lot  of its life running rich.

I'd wager a bet ... $5.00 !... that this explains the excessive wear on the inlet valves which  have been continually  running wet and thus deprived of lubrication. The combustion chambers are far too black as are the piston tops. By the time the whole  lot is burnt off the exhaust valves are black too BUT not excessively worn.
Maybe someone fiddled with the WUR so that it ran rich to compensate for the blown head gasket. dunno

But it raises the spectre of block wear could be similarly affected.

Time to take some accurate bore measuremnets unless the pistons are coming out in which case,.all will be revealed.!
#3
Mechanicals / Re: W116 6.9 (6632) engine reb...
Last post by Randys01 - Today at 01:51 AM
Before going any further how true are the heads?
You can't take much off these before you run into problems of camshaft timing and valley cover  machining.


Meanwhile...examining the pieces.  This is rather odd.......
the inlets are worn worse than the exhaust.?
all valves are as black as pitch.?
it doesn't look like the exhaust valves have sat on their seat (s) for a looong time.???n

You have committed to a course of substantial overhaul.
1.you have new valve guides? The old ones are clearly worn as per normal.
2 new exhaust valves  on the way
3 inlet valves which are clearly well out of spec but no new ones on the horizon.?

What are the valve seats like?. They are going to have to be recut and faced anyway.

New valve stem seals of course.

You are going to have to consider new valve lifters.

moving to the lower part of the motor....how stripped down are you prepared to go?


 
#4
Mechanicals / Re: W116 6.9 (6632) engine reb...
Last post by HPC - Today at 12:03 AM
Exhaust valve stem ~10.92  spec 10.93-10.95
Intake valve stem ~8.87  spec 8.95-8.97

Not sure about the valve guide wear amount, but the play in the old guide is much more when comparing to a new guide. Even the new guide has noticeable play.

Waiting for the new exhaust valves to arrive, still searching for new intake valves...

Springs measure about 49.40 and 45.10mm

If I can find intake valves I can have the heads rebuilt. The big question is with this much wear on the heads, wil the block need to be rebuilt as well?

#5
Test Drive / Re: New Stainless Steel Euro B...
Last post by sutekh - Yesterday at 11:10 PM
Quote from: rumb on Yesterday at 07:48 PMSalt Lake Plating did an excellent job on several pieces that I sent them.

All the other platers in town have closed shop in the last few years unfortunately. SL is the only outfit left for 500mi, and they know it. They quoted me $3,200 to refinish my set!  :o

Speaking of other shops closing, I barely managed to get these back from the one other remaining outfit I'd contracted with that then shut down. Apparently all the employees left under less than amicable terms, and had been deliberately doing terrible work for months to sink the owner. Hence my quality problems...

At least my brackets and carriers are good, and recently powder coated. It looks like these Tynda repos are just the covers.
#6
Test Drive / Re: New Stainless Steel Euro B...
Last post by rumb - Yesterday at 07:48 PM
Glad you found a solution that works for you. Salt Lake Plating did an excellent job on several pieces that I sent them. You are correct that some vendors are not trustworthy.
#7
Test Drive / Re: New Stainless Steel Euro B...
Last post by sutekh - Yesterday at 09:12 AM
Has anyone here "Activated their Passion"? After now 2 fiascos with OE bumpers, I'm about to give these a shot and would love to ask someone with experience a few questions.

Due respect to those suggesting restoring is better... I've now dealt with sellers trying to scam me, shipping companies damaging them, misrepresentation (they're NEVER as nice as advertised and are all 50yrs old), and two of the worst plating jobs I've ever seen.

For all of my months of effort and thousands wasted, I am the proud owner of a complete set of OE euro bumpers with dents that have been pounded out, corroded portions of the rubber tracks, and chrome with so much poor adhesion and shadowing that I'd never put them anywhere near my car.

Sign me up for a new set all day long, please!
#8
Mechanicals / Re: W116 6.9 (6632) engine reb...
Last post by Randys01 - Yesterday at 01:29 AM
The original question was whether this motor was beyond repair..we've  looked at a number of what I would call "CRITICAL MARKERS" from the top of the motor. Everything IMHO looks a "go".
eg  Rocker wear seems remarkably good .

You have sent the heads out I presume to be dismantled. Now we can see the valves and they have  measured up under sized.
It's impossible to tell from a photo. how much have they worn?

But the million dollar question is how did the valve guides measure up.?

AND
what about the valve springs?  How did they measure?
 
#9
Mechanicals / Re: W116 6.9 (6632) engine reb...
Last post by HPC - 06 February 2023, 11:53 PM
Hey Randy, I have the heads back, here are pictures from Cyl 1 and 5.  they all look similar. 

You can also see the wear on the valves, out of spec on the stems.
#10
Interiors & Exteriors / Re: Back Window for 1989 450 S...
Last post by rumb - 06 February 2023, 04:34 PM
Locally is best, but if you cant find one, I have one available in Colorado. I have no idea how to ship it....

It's heated version, but the wires are broken.

While on the subject. Items 5 or 40 - is this the plastic material that goes around the perimeter of the glass before it is inserted into the rubber seal?  One would need @4meters of it.


https://nemigaparts.com/cat_spares/epc/mercedes/1/fg/116033/68n/67/001/

both are avail from MB.