bobc
Daily Driver
Posts: 109
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Post by bobc on Feb 28, 2022 12:59:07 GMT -8
I pulled a couple of plugs (1600 dp) to see what shape they were in(black) and found that the time sert came out with the #3 plug. There was evidence of blow by on the porcelain . Before I pull the engine I thought I'd check in on those who have dealt with this - what worked for you? I know that inspecting the head will help me to decide , i.e. chase the threads and try a new time sert , I've read that some have applied a high temperature green loctite to the threads - that doesn't sound too permanent. At what point do I look for new heads?
Bob
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Post by hightopRob on Feb 28, 2022 20:35:21 GMT -8
I have repaired them with a helicoil kit that worked just fine. If you go the locktite route I would use the red version unless the green is the strongest.
From what I have read green is for bearings and red is for threads, different applications
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Post by Volktales on Feb 28, 2022 22:43:20 GMT -8
We use Time-Serts for this job. At least we used to, back in the day when these cars were still daily drivers... Green Locktite was generally used for bearing related things like sealing bearings in damaged housings. It was thicker and would "fill up" imperfections.
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bobc
Daily Driver
Posts: 109
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Post by bobc on Mar 1, 2022 11:57:32 GMT -8
Thanks for the tips . I think I'll be able to do this without pulling the engine. The time sert that came out with the plug looks short as it only covers half the threads on the plug. I'll pick up a pack of the longer ones and a tube of the red loctite and see what happens. It's been suggested that you should put some anti-seize on the plug threads to help prevent the time sert from coming out.
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Post by mitchy965 on Mar 1, 2022 15:06:22 GMT -8
you will get by with another insert for now but remember these are temporary measures. the insert will always loosen its just a matter of time. most plug manufactures insist that you put nothing on the threads as it spoils the heat transfer of the plug and changes its self cleaning heat range. instead they want you to clean the threads with a rethread tap and install it dry as the coating/plating on the threads is designed as the release agent.
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bobc
Daily Driver
Posts: 109
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Post by bobc on Mar 4, 2022 9:40:13 GMT -8
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bobc
Daily Driver
Posts: 109
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Post by bobc on Mar 4, 2022 10:16:32 GMT -8
Last summer while bench testing the engine , I did a compression test. I was having trouble threading the tester into the #4 cylinder . Taking a close look , I could see that the time sert had somehow threaded its way into the head . I'm assuming as I turned the tester it was turning the time sert. As I tried to work it back out , it fell into the cylinder - not good. The photo shows what I saw when the head was removed.
Yesterday I got the #3 plug back together. I was told you could put a small dab of JB weld on the outer time sert thread and anti-seize on the spark plug thread. We'll see how it goes. I do have the original heads that I had switched out because of poor compression. I'll put them on the list and see if I can do anything to revive them for a Plan B.
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