JHZR2
Staff member
Had gotten my injectors rebuilt for my 91 300D. Time to install, and the heat shields are to be replaced. I pulled four of the five straight out. No problem….
The last (rear) one? Magnet wouldn’t get it out. Tried a pick. No luck. Started looking for options, read a variety ranging from screwing a lag bolt into the hole, jamming a screwdriver into it, etc. The most plausible were to use an awl or punch to tap around the heat shield to break the carbon loose (with the help of a penetrant). No luck.
The shield started to become disfigured even when just pulling on it.
Kept trying. Had hoped to work it loose, or able to move at all. Eventually I even tried drilling, cold chisel, punches, no luck at all.
So now I’m screwed. Really hoping I don’t need to pull the head. I think I can just pull/replace the prechamber. It takes a splined socket and then a slide hammer threaded into the injector threads in the prechamber.
Maybe I was too heavy handed. But it wouldn’t budge with progressively more aggressive approaches. Should I have tried heat? I had already wet everything in a lot of penetrating oil.
Knock on wood I’ll be able to get the prechamber out. With my luck it will be seized in there too. How four went so well and the last one didn’t is annoying and frustrating.
The last (rear) one? Magnet wouldn’t get it out. Tried a pick. No luck. Started looking for options, read a variety ranging from screwing a lag bolt into the hole, jamming a screwdriver into it, etc. The most plausible were to use an awl or punch to tap around the heat shield to break the carbon loose (with the help of a penetrant). No luck.
The shield started to become disfigured even when just pulling on it.
Kept trying. Had hoped to work it loose, or able to move at all. Eventually I even tried drilling, cold chisel, punches, no luck at all.
So now I’m screwed. Really hoping I don’t need to pull the head. I think I can just pull/replace the prechamber. It takes a splined socket and then a slide hammer threaded into the injector threads in the prechamber.
Maybe I was too heavy handed. But it wouldn’t budge with progressively more aggressive approaches. Should I have tried heat? I had already wet everything in a lot of penetrating oil.
Knock on wood I’ll be able to get the prechamber out. With my luck it will be seized in there too. How four went so well and the last one didn’t is annoying and frustrating.
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