Vacuum valve and glow harness

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Tom Plunket - 25 Apr 2008 03:58 GMT

I'm hoping to find part numbers for the vacuum valve between the vac
pump and the brake booster (it's physically broken) as well as for the
harness between the glow relay and the plugs (one of the leads is frozen
on the old glow plug, and the insulation is all cracked and broken off
all around), but I can't seem to access detali.ru. Anyone know where it
went, or if I can find this info elsewhere?

Thanks.

-tom!

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DougS - 25 Apr 2008 13:45 GMT

> I'm hoping to find part numbers for the vacuum valve between the vac
> pump and the brake booster (it's physically broken) as well as for the
[quoted text clipped - 8 lines]
>
> --

I'll look and see if I have any part numbers for those, but they seem
to be pretty generic items. You didn't mention what year and model you
have. So I assume its for a '79 300TD.

The vacuum valve is just a check valve with two exit ports. The trick
for that one is getting the right size fittings at the auto parts
store. As long as you are replacing the valve, you can replace the
vacuum hose that its connected to as well. Getting all that shouldn't
cost more than $10 or $15 at the local auto parts store. Assuming, of
course, that they have those hose and valve sizes in stock.

I would think that the harness for the glow plug is also generic. If,
by harness, you mean the large diameter wires that run from the glow
plug relay to the plugs. Assuming you have enough length to work with
(which may be a bad assumption), you can cut the old connection off
and strip back the wire and attach a new connection. Otherwise, its
just getting a few feet of large wire to replace it.

I should mention that I haven't done either of these things, but I
have been looking at my check valve on my 84 300D recently to inspect
it.

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Tom Plunket - 26 Apr 2008 09:05 GMT

> I'll look and see if I have any part numbers for those, but they seem
> to be pretty generic items. You didn't mention what year and model you
> have. So I assume its for a '79 300TD.

Ah crap, yeah it's the '85 D that I've mentioned more recently, wrt the
glow plug problems it's been having.

I got new plugs, the pencil-type are the ones Performance sent me.
Pulled the #1 cylinder plug, but the wire connection is totally corroded
onto the nut. I wondered how I'd ever get it out of there and then
discovered that that portion of the glow plug was actually separated
from the body of the plug. Anyway, got that all out but even with vice
grips I can't break the corrosion. I'll try more tomorrow (nicer to
work in the daytime) and if nothing else I'll put the five new plugs in.
#1 is the only one I've pulled so far, 2, 3, and 4 look like they
shouldn't be too bad but #5 also looks like a total bitch with the oil
filter right there (not to mention that's where the tap for my fuel
heater goes into the cooling system, which means joy as well).

> The vacuum valve is just a check valve with two exit ports.

I found this part on BuyMBParts.com. $26 plus shipping, and it comes
with the hose and presumably the proper fittings for the vacpump and
brake booster.

> I would think that the harness for the glow plug is also generic.

It's one of those MB plugs on the relay side. I haven't opened one of
those up to see if it's easy to swap out connections, but I ended up
calling BuyMBParts today and they found one for me. I don't want to
screw around with cutting the wires, hoping they reach, and replacing
the connectors, so I just ordered it. Turns out they just ordered it
from MB, so I would have been just as well to go to the dealer myself,
but whatever; it's on its way and I can't drive the car 'til the vacuum
line gets here anyway (the two smaller fittings off of the valve are
broken off clean; didn't even think about disconnecting the vacuum lines
before pulling the fuel rails).

> I should mention that I haven't done either of these things, but I
> have been looking at my check valve on my 84 300D recently to inspect
> it.

I'm relatively certain the one in my '79 isn't holding vacuum either,
and now that I think about it I can't believe I forgot to order the one
for that car as well. Ah, so it goes. Now I know how it comes maybe I
should just get that at the dealer... I'm not sure how to diagnose it
though, as I'm not sure which direction it's supposed to block flow.
Does it provide and hold vacuum to the booster regardless of other
system leaks, or does it use the booster to generate additional vacuum
for the system?

thanks for the response.

-tom!

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Wan-ning Tan - 27 Apr 2008 05:46 GMT

You found it already. Th check valve does not come by itself. It is
part of the hose (between b rake booster and the vacuum pump).

> I'm hoping to find part numbers for the vacuum valve between the vac
> pump and the brake booster (it's physically broken) as well as for the
[quoted text clipped - 6 lines]
>
> -tom!

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