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6.9 engine rebuild with pics

Started by nathan, 16 July 2017, 10:32 AM

nathan

PT, but it has the MB logo on it! ha. Thats the problem with some of that stuff, finding other sources vs getting 'original' and at least knowing its an acceptable brand.

Thomas, ill try and get time to get back to the mechanics and find the manufacturer. I took these pics before I gave it all to him so at least people will have the part numbers a bit easier.

Max, I haven't yet found the manifold bolt numbers, but I did just order some last night so should be able to measure for you.

regards
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

UTn_boy

You may want to buy Mercedes brand flex discs, front and rear, as the FEBI ones are notorious for  high speed vibrations. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

ptashek

Quote from: UTn_boy on 18 July 2017, 02:03 AM
You may want to buy Mercedes brand flex discs, front and rear, as the FEBI ones are notorious for  high speed vibrations.

I have a full FEBI set on my car. No vibrations to report from 0 to 220km/h.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE

s class

All those new bits with 100... part numbers are enough to make me weep with jealousy. 


[color=blue]'76 6.9 Euro[/color], [color=red]'78 6.9 AMG[/color], '80 280SE, [color=brown]'74 350SE[/color], [color=black]'82 500SEL euro full hydro, '83 500SEL euro full hydro [/color], '81 500SL

TJ 450

It's like that... the best thing yet though is the water pump. That is a work of art, and might be the last new one on the planet.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

nathan

fe more bits today including the brake booster gasket, one of the two rubber buffers which fit on the side of the engine bay to protect the bonnet from striking in front of the springs (also the same part on the back of your chrome grill on each side for same role), and the two plastic white deflectors which fit on front cross member to stop your bonnet striking the cross member on closing
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

nathan

not heard about the Flex discs. I think they came from Niemoller who supplied a few bits for us.  At the end of the day with most rubbers, i think anything is better than whats on our 40 year old cars, especially when i drive it only once a month or so!  im not usually too bothered to see the Febi brand, i thought they were ok?!
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

ptashek

Quote from: nathan on 18 July 2017, 10:38 AM
At the end of the day with most rubbers, i think anything is better than whats on our 40 year old cars, especially when i drive it only once a month or so!  im not usually too bothered to see the Febi brand, i thought they were ok?!

FEBI are OK for some parts, and aren't for others. My resto thread has some more details around that. The flex discs are good. Suspension bits are good as well. Gearbox mounts are poor. Engine and steering damper are the same part you get from MB, both made by Stabilus.

In many respects the MB parts are worse, because they're NOS items that sat on a shelf for 20+ years.

But, there's as many opinions as there's people :)
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE

oversize

Very impressive!! One day I might get to order at least some of those parts!
I'd be keen to know the weight of the pistons & how they might compare to ones made from modern materials in the same size.... Would they be the reason MB determined they'd hit max piston speed in the 6.9 or was it more to do with the long stroke?
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

oversize

Oh and I bet any Ford or HOLDEN fan would think all their Christmas' had come at once if they were able to buy parts like this for a 40+ YO car!
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

Randys01

Whilst the stroke is longish, the engine is still oversquare and probably not proportionally disparit with many US engines which don't rev much harder in stock setup.
I would suggest the M100 pistons weigh more because of the iron band in them to tame the piston slap...............I'd wager the rods and pistons with rings would be pretty hefty and it's this reciprocating mass that puts the brakes on the big rev.

There people here better qualified than me to comment on how to get your big Block yankee pushrod V8 to swing but piston and rod weight are generally the first port of call.

UTn_boy

Ptashhek and Nathan, you can believe as you wish about the flex discs.  I only made mention of this due to the number of FEBI brand flex discs I've had to exchange for MB brand in the past.  The customers complained of vibrations, and getting rid of the FEBI flex discs took care of the problem.  It may be that Lucas acquired some old stock FEBI discs, which were wonderful.  However, the new production FEBI discs are problematic.  Use at your own risk. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

TJ 450

I've used the Lemforder discs in the past (they even have the MB marking ground off) and would generally prefer those, but I am running a Febi on my W126 rear and that hasn't caused any trouble with vibration, and it's been about 30,000km since as I drive the car everywhere.

If there's no vibrations after mounting I would say all is OK, and as Nathan said, they will be much better than old hard and cracked ones.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

UTn_boy

Well, we have to remember that whether it be the OE supplier or an aftermarket supplier, they have the molds to make them with. The mold includes the part number and the Mercedes star.  The aftermarket suppliers have to scrape off the star and the number for obvious reasons, but remember that they are not made the same.  They can't sacrifice the physical dimensions for fitment reasons, so they have to make it out of a different material and/or use different hardware that's inside of the disc.  It's this different material/hardware that causes problems.  Never be fooled by the number and star having been scraped off.  That never means that it was an original Mercedes part.  It only means that a company has reproduced it using different materials....usually substandard materials compared to what Mercedes made them out of.
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

TJ 450

Actually, they are the exact same part as the Genuine unit in this case, ZF/Lemforder are one of the manufacturers of the Mercedes branded parts and the Mercedes markings are ground off after manufacturing. This is a fact, and it applies to quite a few parts from different manufacturers.

Febi on the other hand are entirely aftermarket when it comes to quite a few of the parts, although that obviously doesn't apply to parts like the Stabilus gas struts or engine shock absorbers, steering dampers etc.

I'll also say that having experienced poor quality Febi coolant hoses for a W126 280SE, I would personally steer clear from them where possible as well in most cases, but if I had the parts on hand already I'd use them.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500