|
|
|
#1
|
||||
|
||||
My injectors didn't have heat shields
This is for my '74 240D. I got some rebuilt injectors from bgkast and installed them yesterday. A new set of heat shields came with the injectors. Well, I got the old injectors out, and this is what the bottom of the hole looked like:
It doesn't look anything like a heat shield down there, so I dropped a new heat shield in the hole and it looked like this: I put the new injectors in and torqued them to 50 lb-ft and I've got no leaks so far, it has only been a day though. Here's what the ends of the old and new injectors look like. I was hoping to cure the huge plume of smoke that I'd get on a cold startup, and the loud rattling/nailing sound when the engine was idling. Well, I think it lessened the smoke, although I need to start it on a chilly morning to be sure, and I don't know when we'll have another one of those any time soon. But the loud rattling is still there. I may be a little better, but sometimes it still sounds like I have rocks in the engine. Maybe that's just the way the w115's sounded? I'll try a diesel purge some time and start using straight biodiesel now that its warm.
__________________
1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
#2
|
||||
|
||||
I'm surprised your old injectors sealed!
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#3
|
||||
|
||||
You can get steel-steel sealing if you crank it tight enough
__________________
$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#4
|
||||
|
||||
tighten till it squeaks....
__________________
83 300SD Dark Silver Dark brown inside |
#5
|
||||
|
||||
That may have been the case. I used a cheater about 3' long and a considerable amount of force (I have an old sacrificial ratchet as a breaker bar and each time I thought the wrench broke) to break the old injectors free.
__________________
1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
#6
|
|||
|
|||
Hate to tell you this, but the smaller shiny round piece in the picture of your injector hole is the injector seal, or "heat shield" as you call it. The old style was a round "T" shaped seal that slipped into the prechamber hole with the top of the "T" showing and is what the nozzle seals against. If you are using the new style one-time use crush-style "heat shields", you should remove this old style seal.
My OM621 had these, which I replaced with the new style. I wish I would have left the old style in, as they can be used over and over, while the new style should be replaced every time the injector is removed. I would take the injectors out, throw away the "heat shields", and use the original seals. As for the rattling noise, my OM621 (which is a direct decendent of your motor) does that, usually when you first start the engine and till it warms up. There's a name for that problem, but can't think of it at the moment. It's an annoyance but hasn't caused me any problems in 100,000+ miles. |
#7
|
||||
|
||||
Quote:
__________________
1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
#8
|
|||
|
|||
thats definitely what he's saying.
And if you look at your injector tip (nozzle), you will see it has been properly protected from heat and pressure. |
#9
|
|||
|
|||
There is a special socket and slide hammer for removal of your injector receptacles. The socket fits over the tangs of the locking ring (The big round thingie with the upright "ears") and the locking ring is removed. The glow plugs need to be removed FIRST! Then the special slide hammer threads into the receptacle and you remove the entire piece along with a few pieces of your elbow on the hood and that soft tender bit of flesh between your thumb and fore finger.
You can then examine the "mixing ball" on the end of the receptacle and soak the old seals loose in some carb cleaner, mineral spirits, what have you. Clean the head holes with a wire bottle brush and a shop vac to get all the loosened soot. You then replace the seal under the injector chamber, replace the receptacle (using just a slight dab of NeverSeeze on the threads), re-install and torque the locking ring, re-insert the glow plugs (you might have to undo one or two of the lock rings and twist the socket to receive the glow plugs) and then re-install the injectors. Don't be surprised if you are missing a ball from the "mixer". Pretty common occurrence and you need to replace the socket. THIS can cause the "death rattle" at start-up and idle. |
#10
|
||||
|
||||
Quote:
Oh, and what would be the harm of leaving the old seals in with the new crush washer seals on top? The only thing I can think of is the crush washers are shaped to fit the bottom of the injector hole, and that's probably without the old seals in place. Anything else?
__________________
1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
#11
|
|||
|
|||
Quote:
WHAT??? You're passing on the chance to get absolutely filthy, nasty greasy?? What kind of old Benz owner are you? I doubt you could see the ball with a scope due to the amount of soot and gook which will be present in the chamber. I'd just remove the crush washers and slip the injectors over the old seals. You don't want to use the crush washers over the old seals because they are designed to fit into the relatively flat area in the socket. The old seals have a "pocket" which is shaped to fit the injector tips. If you don't have any fuel leaks using the old seals then you're good to go. Rattle? WHAT rattle? That's just your baby clearing its throat waiting to turn loose those ferocious 72 horses! |
#12
|
||||
|
||||
I had a lone heat shiels that was stuck and I got it out with a hook made from a coat hanger. If that didn't work, my next Mcgyver trick was to use a long self tapping sheet metal screw. I think that would get the most stubborn heat shield out.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#13
|
||||
|
||||
Quote:
The easiest way to get those puppies out is to turn over the engine. Just dont be in the way they shoot out. I haven't been hit by one but they come out fast enough to make me stay worried. PS I have the prechamber ring tool and the slide hammer adapter for rent (dep + mail + 6pack of beer).
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#14
|
||||
|
||||
Quote:
But if I need to remove the prechambers, I'll hit you up for those tools. I'll send you some local PA beer
__________________
1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
Bookmarks |
|
|