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-   -   Vacuum Pump Implosion? W115 240D (http://www.peachparts.com/shopforum/diesel-discussion/153598-vacuum-pump-implosion-w115-240d.html)

diametricalbenz 05-19-2006 02:09 AM

Vacuum Pump Implosion? W115 240D
 
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I was driving home in the W115 240D on the freeway and noticed some louder than usual engine noises. All of the sudden when traffic built up I pressed down on the brakes and no vaccum boost was available! I was going through south central and the engine was still running and there was oil pressure so I pushed on.

When I got home I found that the whole front end of the vacuum pump had cracked from top to bottom.

Has anyone seen something like this?

I guess it's metal fatigue from 32 years of operation :rolleyes:
http://www.curtisgee.com/digital/P0004910_600.jpg

ForcedInduction 05-19-2006 02:37 AM

Well, when you figure 1 pulse per engine rotation...

3000rpm highway cruise for 1 hour. That's 180,000 pumps! I can't even imagine how many times it pumps over 200,000+ miles! :D

Amazing that they don't break sooner.

Diesel Giant 05-19-2006 07:50 AM

Oh I have never seen a pump do that. I bet the rocker arm assembly failed.

Craig 05-19-2006 08:40 AM

Take a look at the photos of mine in post #24:

http://www.peachparts.com/shopforum/diesel-discussion/151324-stuck-ne-vacuum-pump-failed-2.html

Most likely the pump failed and broke the casing. You don't want to drive it until you replace the pump and take a look in the oil pan for loose parts. Hopefully, you will be luckier than I was.

diametricalbenz 05-19-2006 02:22 PM

Quote:

Originally Posted by Craig
Take a look at the photos of mine in post #24:

http://www.peachparts.com/shopforum/showthread.php?t=151324&page=2

Most likely the pump failed and broke the casing. You don't want to drive it until you replace the pump and take a look in the oil pan for loose parts.
Hopefully, you will be luckier than I was.

Craig, your vacuum pump looked much worse than mine! :eek:

It would seem that the pump failed and hammered away at the case. I am interested to know what happened. When I get the pump back I will post some follow up pictures. I hope the pump from the 1979 240D will fit on it!

Wow am I happy that I upgraded my AAA membership to Plus status 3 weeks ago! The memership fees paid for itself in one tow. :rolleyes:

Craig 05-19-2006 02:47 PM

Quote:

Originally Posted by diametricalbenz
Craig, your vacuum pump looked much worse than mine! :eek:

It would seem that the pump failed and hammered away at the case. I am interested to know what happened. When I get the pump back I will post some follow up pictures. I hope the pump from the 1979 240D will fit on it!

Wow am I happy that I upgraded my AAA membership to Plus status 3 weeks ago! The memership fees paid for itself in one tow. :rolleyes:

My whole ugly story is in the other thread, but you're correct, the pump let go at about 80 mph and caused a bunch of collateral damage. Hopefully yours didn't generate as much shrapnel, but I ended up with about 8 pieces of metal in the oil pan. It's probably cheaper to find a used pump that fits and rebuild it, than to buy a new one (about $500). If you were able to drive it home, you're probably OK, but I would still look in the pan.

diametricalbenz 05-19-2006 03:17 PM

Quote:

Originally Posted by Craig
My whole ugly story is in the other thread, but you're correct, the pump let go at about 80 mph and caused a bunch of collateral damage. Hopefully yours didn't generate as much shrapnel, but I ended up with about 8 pieces of metal in the oil pan. It's probably cheaper to find a used pump that fits and rebuild it, than to buy a new one (about $500). If you were able to drive it home, you're probably OK, but I would still look in the pan.

I'll have to read through it for tonight's evening reading since I am at work now. ;) I have noticed that my oil pressure is lower than normal after freeway cruising. I wonder if a piece broke off internally earlier and is restricting the oil pump. I guess pump breakage is just a degenerative resultant effect.

Worst case scenario, if it's bad, it's time to yank the 300D motor and drop it in!

t walgamuth 05-20-2006 02:55 PM

yeah, sounds like it is restricting your intake on the oil pump.

not good.

tom w


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