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212 grader injectors

212 grader injectors

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212richard
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I had an injector nut turn halfway round and stop. I suspect a thread is cold-welded. The only choices I think I have are both ugly: A) use a bigger impact and wind the threads out of the head, and fix it later (IS there a fix?) or 😎 sacrifice the nut and possibly the injector to save the head. Which would be cheaper, repair the threads or buy a 5B9297 valve assem.? My parts book shows pre-chambers with set screws, but my head doesn't have any set screws so I'm not really sure what's down there. May I hear from you gentlemen? Thanks, Fritz
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Fri, Apr 13, 2012 10:44 AM
Old Magnet
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Need to sort out what 212 you have, preferrably with a s/n.
A 5B9297 injector is the early style that uses a set screw on the pre-combustion chamber.
Later D311 engines don't have set screws and use a different injector arrangement.
Both styles screw in to the pre-combustion chambers, not directly into the head.
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Fri, Apr 13, 2012 9:55 PM
212richard
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Reply to Old Magnet:
Need to sort out what 212 you have, preferrably with a s/n.
A 5B9297 injector is the early style that uses a set screw on the pre-combustion chamber.
Later D311 engines don't have set screws and use a different injector arrangement.
Both styles screw in to the pre-combustion chambers, not directly into the head.
[quote="Old Magnet"]Need to sort out what 212 you have, preferrably with a s/n.
A 5B9297 injector is the early style that uses a set screw on the pre-combustion chamber.
Later D311 engines don't have set screws and use a different injector arrangement.
Both styles screw in to the pre-combustion chambers, not directly into the head.[/quote]

S/N 1R734. That is exactly what I thought they did. Thread into a dry hole like some I.H. s. I also didn't know it was a D-311. My operators manual shows graders with two different engines and classify them simply as "earlier" and "later". I have both manifolds on the same side. Is that the 311?
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Sat, Apr 14, 2012 9:34 AM
Old Magnet
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Reply to 212richard:
[quote="Old Magnet"]Need to sort out what 212 you have, preferrably with a s/n.
A 5B9297 injector is the early style that uses a set screw on the pre-combustion chamber.
Later D311 engines don't have set screws and use a different injector arrangement.
Both styles screw in to the pre-combustion chambers, not directly into the head.[/quote]

S/N 1R734. That is exactly what I thought they did. Thread into a dry hole like some I.H. s. I also didn't know it was a D-311. My operators manual shows graders with two different engines and classify them simply as "earlier" and "later". I have both manifolds on the same side. Is that the 311?
The 1R734 (1942) would normally have the early engine D3400, with manifolds on the same side and would have the set screw combustion chambers. The later engine 1947-up is the D311.
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Sat, Apr 14, 2012 9:43 AM
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