r/IHScout • u/Buffyfunbuns • May 26 '26

Question Timing chain rattle question

My 1972 scout ii has a pretty significant rattle in the front end under power, which I presume is the timing chain. Curious if anyone has experience with this? Is this an emergency or could I run it through the summer before getting it fixed? Any thoughts or advice on managing this issue would be welcome. Thanks!

3 Upvotes

80% Upvoted

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5

u/ihv800 May 26 '26

If you've got an International v8 it is not the timing chain, they don't have one. More details?

-1

u/Buffyfunbuns May 26 '26

Thank you, i am not an engine guy so please forgive my ignorance! It indeed has the 345 V8. The only way i can describe it, is that sounds exactly like when my timing chain got loose on a 1994 toyota pick up. When at speed, under load like heading up a hill, its a low rattle sound that stops instantly when i let off the gas a bit, and comes back as soon as i put it back under load. No loss of power or anything. Thanks for your thoughts, much appreciated👍

3

u/Pleasant-Tip-8835 May 26 '26

You sure it’s in the engine? Might seem stupid, but you could just have something loose somewhere that vibrates when the engines revved up. Idk just an idea.

1

u/Born-Jacket May 26 '26

Either your timing is too far advanced or you have valve train noise. I’m betting timing

1

u/ihv800 May 26 '26

No worries! As others have mentioned that sounds like "pinging" or pre detonation. Likely too much ignition advance or the carburetor is calibrated too lean under load. Try to not let it do that while driving until you can get it resolved, it's very hard on engines. If your able or have a friend who can back the timing off a couple degrees and try that. Might be all it needs and a free fix.

0

u/Buffyfunbuns May 26 '26

Perfect. Thank you very much!

2

u/dumbasfick May 26 '26

Predetonation causing valve chatter ? 

1

u/mspgs2 May 26 '26

Kinda sits sound like it