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Member Poll
How many miles on your W124?

0mi - 50,000mi
0mi - 50,000mi
5% [87 Votes]

50,000mi - 100,000mi
50,000mi - 100,000mi
10% [181 Votes]

100,000mi - 150,000mi
100,000mi - 150,000mi
21% [382 Votes]

150,000mi - 200,000mi
150,000mi - 200,000mi
25% [446 Votes]

200,000mi - 250,000mi
200,000mi - 250,000mi
18% [330 Votes]

250,000mi - 300,000mi
250,000mi - 300,000mi
10% [181 Votes]

300,000mi - 350,000mi
300,000mi - 350,000mi
5% [86 Votes]

350,000mi +
350,000mi +
7% [118 Votes]

Votes: 1811
You must login to vote.
Started: 03/14/2011

Polls Archive

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» W124-Zone.com » Technical Issues
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engine rebuild - breaking in new piston rings
evildiesel
Just finished rebuilding '87 m103 and dropped it back into the chassis, took it for a quick test run and noticed I'm losing power going uphill and not accelerating like it used to, is there a certain amount of time you need to run the engine to "break-in" the new piston rings or did I just eff up somewhere in the process of the rebuild? also the dist cap has a pretty worn center spring pin, so I've got a new cap and rotor ordered and on their way, I haven't heard or felt any misfires though.
 
evildiesel
Am I the first on this forum to rebuild an m103 down to the crankshaft bearing journals? no replies Frown
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
evildiesel
ran it for 10min today, starting to suspect timing may be off by a little, gonna wait for my pops to get home so i can compare his, will update then
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
jess
was there a issue with the timing?
HONDAS SUCK
89 300E TURBO CUSTOM W124
95 E420 W124
 
evildiesel
Originally my compression was down to 90 and less psi on all cylinders so i decided to just rebuild it completely, after starting it, it feels like it doesnt have as much power as it should going uphill on third gear, at this time im suspecting the timing is a little off
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
evildiesel
going to wait till friday to re-adjust timing, I've got a cap and rotor that should come in by then, here's a pic of m103 pistons for those of you to scared to open it up all the way
lh4.googleusercontent.com/-o76BFsb4Wxw/T5ltI6QjzcI/AAAAAAAAAKQ/wXHeWVsx-ls/s903/2012-04-05_19-58-25_131.jpg
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
ps2cho
Nice!

One of these days I'll either Turbo, or pull my 2.6L engine apart and make it into a 3.6L monster!
1988 Pearl Grey Metallic Mercedes 300TE - 114,000mi
1987 Black Mercedes 260E - 92,500mi
2002 Silver CLK320 (Girlfriends) - 104k
w124-zone.com/downloads/photos/260E/AMG_Gen_I/side1-sig.jpg.www.w124-zone.com/downloads/site/wagon-sig.jpg
 
http:///www.w124-zone.com
evildiesel
ps2cho wrote:

One of these days I'll either Turbo, or pull my 2.6L engine apart and make it into a 3.6L monster!


Thats a hell of a bore to do on a 2.6 block lol
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
evildiesel
I put on new distributor cap and rotor, also adjusted timing which was a tooth off. Took her out for a test run and she stalled on me, no mechanical symptoms, engine starter works ok no unusual noise but engine doesnt turn over, I can't hear any combustion, i swapped a bunch of parts off my dad's 300E: fuel pump relay, coil, spark cables, compared fuel injection line output and his was definitely putting out more from the fuel distributor than mine was, tomorrow I'm going to take it apart and see what I can do with it. While it was running it did feel more powerful than before Grin
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
ps2cho
I'd do a fuel pump volume test to rule out everything backwards of the distributor
1988 Pearl Grey Metallic Mercedes 300TE - 114,000mi
1987 Black Mercedes 260E - 92,500mi
2002 Silver CLK320 (Girlfriends) - 104k
w124-zone.com/downloads/photos/260E/AMG_Gen_I/side1-sig.jpg.www.w124-zone.com/downloads/site/wagon-sig.jpg
 
http:///www.w124-zone.com
evildiesel
Already started taking the FD apart, got it cleaned and I just need to get some o-rings for it, couldn't get a temporary replacement because some asshole has been going to all the wrecking yards in sd and just ripping them out. I know its the same bastard because the fuel lines have all been cut the same way, this jerk off has no consideration for people that might need an injector line and just cuts them. On top of that they're all missing from all of the benz CIS models, 190's 260/300E's, SEL's (i6 and v8's)
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
evildiesel
went to pick your part and got lucky with an FD, slapped it on and still wouldn't start, then took off the valve cover and found a busted cam chain ><, I think I might have tied it too tight, gonna order another and replace it : ( I'm really hoping I don't have a bent valve to deal with....
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
ps2cho
Did you follow procedure for the chain tensioner?

What were condition of chain guides+rails or did you replace them?

Aside from that, in my experience working junkyard distributors are far and few. Unless you have had issues, your distributor is probably fine and you can always run a volume test out of the ports (go to junkyard and grab some injector lines then screw them on top of the distributor, jump pump relay (pins 87+30) or apply +12v if you have MAS to pin 2) and measure each line into a bottle. They should all flow the same fluid. Its a very quick and easy test to prove your distributor in working order.

Distributor rebuilds are difficult so I hope you did everything meticulously! It MUST line up correctly or you'll have a crazy time getting it to run right.
Edited by ps2cho on 05-09-2012 08:46
1988 Pearl Grey Metallic Mercedes 300TE - 114,000mi
1987 Black Mercedes 260E - 92,500mi
2002 Silver CLK320 (Girlfriends) - 104k
w124-zone.com/downloads/photos/260E/AMG_Gen_I/side1-sig.jpg.www.w124-zone.com/downloads/site/wagon-sig.jpg
 
http:///www.w124-zone.com
evildiesel
Actually I didn't, turns out I over tightened the 12 point threaded ring, after taking the chain covers off I noticed the rails/guides were pretty mangled, the tension rail had some deep grooving and the 2 piece guide looked like the chain snapped inside of it, I'm waiting on replacement rails to come in, I got a new chain for it already. I know the "book" says to tighten that ring to 30nm but it never seemed to resist much even when tightened, I'm considering deleting it and just having the spring applying tension to it. As for the fuel distributor I got some Viton O-rings for it and put it back together, I have a used one from a junkyard that is on it now, its definitely working OK but I have to admit, rebuilding the one I replaced the O-rings on is a pain to re-assemble because its difficult to get the middle cylinder to align correctly with the holes and tighten the thin 17mm nut without miss-aligning the holes. Hopefully I get my baby up and running by Sat... My pops keeps buggin me about it sitting in the backyard, but I changed his park brake shoes yesterday so that should keep his mind off it for a few days lol
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
jess
another thing is those tensioners (120 050 02 11) will not "back off" once it starts to hold tension so when you do a chain you have to reassemble it or it will break the chain. and if you cranked it after that happen gonna wanna check the valves
HONDAS SUCK
89 300E TURBO CUSTOM W124
95 E420 W124
 
jess
evildiesel wrote:

Am I the first on this forum to rebuild an m103 down to the crankshaft bearing journals? no replies Frown
btw no but not many interactions on here so dont check that often
HONDAS SUCK
89 300E TURBO CUSTOM W124
95 E420 W124
 
evildiesel
I just re-assembled it and cranked, its knocking like crazy and the idle won't stabilize, I'm thinking what jess is thinking as far as the valve goes, I hope a piston didn't get fucked up because I just rebuilt the whole fucking thing down to bearing journals, I'm gonna take the rest of the day off and remove the head tomorrow and assess the damage...
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
jess
GOOD LUCK TO YA HOPEFULLY THERE ISNT A HOLE FROM A BROKEN VALVE AND AGAIN DONT FORGET TO REASSEMBLE THAT TENSIONER
HONDAS SUCK
89 300E TURBO CUSTOM W124
95 E420 W124
 
evildiesel
fuckin broken valve, bent as fuck with a crack, got it replaced with one from a spare head i keep around. I'm happy as hell pison is ok, just had a little ding in it, i guess piston > intake valveGrin just gotta print the bolt pattern and put everything back, also made a cut on plastic chain guide to cut the "O" that the cylinder head pin goes into and have it as a "U" so I dont have to remove anything below the upper timing chain cover, just have to disconnect the wire harness, coolant hoses, fuel hoses and lift off the head with the intake manifold using a hoist, and save myself the time I would have spent seperating the intake manifold under the hood.
Edited by evildiesel on 05-15-2012 16:31
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
evildiesel
ended up replacing the exhaust valve with an extra I had, still knocking a little and its backfiring a little bit, I'm throwing in the towel for now, going to see how it drives tomorrow afternoon, had it idling for an hour and a half, idle rpm is 500-1000 economy needle is stuck in the red :\
anybody got two cents?
'86 300E manual with '87 m103 - for sale
'87 300D - for sale
'85 190D 2.0 - Hungarian import
 
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