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Forum: Diesel Discussion

11-16-2020, 11:00 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

I agree, this doesn't seem like a good reply. It...

I agree, this doesn't seem like a good reply. It is indeed reasonable to expect people reading the FSM to know "basics", but I don't think some of the omissions we've been considering here fall...

Forum: Diesel Discussion

11-16-2020, 10:56 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

Thank you, I'm happy to be learning things like...

Thank you, I'm happy to be learning things like this. Also thank you for the information about torque vs. shear limits earlier. This was all new to me.

Forum: Diesel Discussion

11-16-2020, 10:51 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

I think I'm convinced now that the bolts I bought...

I think I'm convinced now that the bolts I bought are the intended replacement part, so I think I'm just going to put those in and see how it goes. But thanks for the offer, and I'll keep it in mind...

Forum: Diesel Discussion

11-12-2020, 03:04 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

This morning I wrote an MB parts vendor for...

This morning I wrote an MB parts vendor for guidance on what the correct replacement part # is. He sent me exactly the catalog listing I posted in post 10, except in English (attached). And to...

Forum: Diesel Discussion

11-11-2020, 11:00 AM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

So this morning I decided to go out to the 240...

So this morning I decided to go out to the 240 and look at the mate to the broken bolt (I had screwed it into its socket to avoid losing it). I think the attached photo is pretty illuminating. I'll...

Forum: Diesel Discussion

11-10-2020, 10:02 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

Yes! And in many ways, this is part of what...

Yes! And in many ways, this is part of what confuses me, though maybe I'm overthinking.

Here's how I landed here. Puzzle #1: why did my original bolt break so easily if there shouldn't be any...

Forum: Diesel Discussion

11-10-2020, 09:00 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

This is a new MB bolt. The fact that this came...

This is a new MB bolt. The fact that this came directly from MB is what has led to my confusion. Part of what of I'm trying to figure out is whether there are two varieties of bolt MB used for...

Forum: Diesel Discussion

11-10-2020, 08:55 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

That's the behavior I'd hope to see, but I've...

That's the behavior I'd hope to see, but I've never started a torque wrench in over-torque, so I didn't know what to expect.

I decided to go ahead and look at this. Here is a photo. The...

Forum: Diesel Discussion

11-10-2020, 09:59 AM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

I'll do the protrusion comparison this weekend. ...

I'll do the protrusion comparison this weekend.

What I'm really looking for is some direct confirmation or disconfirmation that MB used multiple bolt types for this application. I found a photo...

Forum: Diesel Discussion

11-09-2020, 10:14 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

Well, I assume the difference in length is owing...

Well, I assume the difference in length is owing to the old one being a stretched-to-max stretch bolt. Can't speculate on the difference in appearance. The new ones came directly from MB. The new...

Forum: Diesel Discussion

11-09-2020, 08:39 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

Update

Update: The old bolt came out easily. Half a turn with a small vise grip, and then it was loose enough to turn by hand the rest of the way. Not sure what conclusion to draw about that; maybe that...

Forum: Diesel Discussion

10-27-2020, 08:38 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

It's good to see optimistic replies! ...

It's good to see optimistic replies!

Assuming pimpernell is right, and the reason the bolt broke was that it was a re-used and therefore weakened stretch bolt, then it likely broke off under...

Forum: Diesel Discussion

10-27-2020, 12:29 PM

Replies: 43

Snapped off rocker arm bolt

Views: 3,257

Posted By carneades

Snapped off rocker arm bolt

While closing up after valve stem seal replacement on an 83 240D manual, I managed to over-torque and break off a bolt holding down the front rocker arm. While I'd certainly be interested in advice...

Forum: Diesel Discussion

10-07-2020, 10:36 AM

Replies: 6

VCV removal on manual 240D?

Views: 1,254

Posted By carneades

I don't need the EGR on a car this old where I...

I don't need the EGR on a car this old where I live, so anything related to the EGR can go. As I now understand it, the thermovalve sends coolant temperature information to the electric switchover,...

Forum: Diesel Discussion

09-28-2020, 09:25 AM

Replies: 6

VCV removal on manual 240D?

Views: 1,254

Posted By carneades

1983. Yes, reading around the internet...

1983.

Yes, reading around the internet last night, I began to form that impression, but I can't seem to find anything definitive. Exiting the thermo vacuum valve on the block, there is a vacuum...

Forum: Diesel Discussion

09-27-2020, 03:45 PM

Replies: 6

VCV removal on manual 240D?

Views: 1,254

Posted By carneades

VCV removal on manual 240D?

Is the VCV responsible for anything important (besides EGR) on a 240D with a manual transmission? I've disconnected the EGR and thought of removing the VCV completely to store it safely indoors in...

Forum: Diesel Discussion

08-04-2020, 09:12 PM

Replies: 2

Severed wire at turn signal socket

Views: 543

Posted By carneades

Severed wire at turn signal socket

Any thoughts on the best solution to this problem?

Forum: Diesel Discussion

11-13-2019, 03:00 PM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

Interesting update: I contacted the author of the...

Interesting update: I contacted the author of the manual that contained the typo leading to this mistake. He claimed that 75 foot-pounds was insufficient over-torque to worry about damage, and that...

Forum: Diesel Discussion

11-11-2019, 03:21 PM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

Will do. I think it was common for Mercedes...

Will do.

I think it was common for Mercedes to make the threads of one part softer than the other, so that the cheaper, less-mission-critical, or easier-to-replace part would strip first.

Forum: Diesel Discussion

11-11-2019, 11:32 AM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

Diseasel gave the kind of explanation I was...

Diseasel gave the kind of explanation I was looking for, and it seems plausible, given that it derives from the logic behind crush washers generally speaking. But even if fears of over-torquing are...

Forum: Diesel Discussion

11-10-2019, 10:45 PM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

Installation into the pre-chamber. Conventional...

Installation into the pre-chamber. Conventional wisdom is that over-torquing damages the nozzle, but I've never seen an explanation for why, which is what led to this post. Do you have a reason for...

Forum: Diesel Discussion

11-10-2019, 10:00 PM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

I installed them last weekend, and have put about...

I installed them last weekend, and have put about 200 miles on them. I couldn't possibly get to this before next weekend, and another 200 miles. But if it is cumulative damage -- that is what I...

Forum: Diesel Discussion

11-10-2019, 09:23 PM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

I have extra heat shields; that wouldn't be a...

I have extra heat shields; that wouldn't be a problem. I'm just short on spare time. I also have no garage or indoor workspace, and it's getting cold where I live, which makes the hard-line wrench...

Forum: Diesel Discussion

11-10-2019, 08:52 PM

Replies: 16

injector over-torque

Views: 2,770

Posted By carneades

injector over-torque

I recently replaced my injectors on an 83 240D. This was my first time doing it. I purchased re-built injectors with Monark nozzles from a reputable (I think) source, and followed instructions...

Forum: Diesel Discussion

03-03-2019, 06:17 PM

Replies: 9

Brake Pedal Hard, but Booster Pressure Good

Views: 1,599

Posted By carneades

Tried to have a look at this today, but couldn't...

Tried to have a look at this today, but couldn't get the allen bolt on the hard mount (by the fuel filter mount) loose, hence couldn't move the vacuum line out of the way of the check valve on the...

Forum: Diesel Discussion

02-27-2019, 02:06 PM

Replies: 9

Brake Pedal Hard, but Booster Pressure Good

Views: 1,599

Posted By carneades

Brake Pedal Hard, but Booster Pressure Good

I have had a hard brake pedal on an '83 240D on and off since a brake master cylinder replacement several months ago. Initially, it seemed the cause was a bad check valve on the booster hose. I...

Forum: Diesel Discussion

02-27-2019, 01:52 PM

Replies: 7

Diagnosing 240D Engine Noise

Views: 1,111

Posted By carneades

Never figured out what was causing the second...

Never figured out what was causing the second sound, but it went away. It disappeared, but then came back, after after a coolant flush. Almost certainly coincidence. I changed the air filter two...

Forum: Diesel Discussion

01-18-2019, 08:13 PM

Replies: 7

Diagnosing 240D Engine Noise

Views: 1,111

Posted By carneades

Yes, the sound seems vaguely familiar to me as...

Yes, the sound seems vaguely familiar to me as well; perhaps I'm recalling it from before I replaced the alternator on my old 240, about 9 years ago. I forgot to test the alternator for play when I...

Forum: Diesel Discussion

01-18-2019, 08:09 PM

Replies: 7

Diagnosing 240D Engine Noise

Views: 1,111

Posted By carneades

Is it possible the engine shocks, which are not...

Is it possible the engine shocks, which are not new, are allowing too much tilt on load, and causing some contact or distortion around the manifold? I'm convinced the sound is coming from that...

Forum: Diesel Discussion

01-13-2019, 08:19 PM

Replies: 7

Diagnosing 240D Engine Noise

Views: 1,111

Posted By carneades

Diagnosing 240D Engine Noise

Hi All. I was hoping to find some help identifying two different problem noises coming from the engine compartment of a 1983 240D. I have posted youtube clips of each one, so I'll put the links...

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