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93 850 bolt stripped timing belt tensioner (update...finally) 850

posted by  Shaughnessy on  Mon Oct 29 13:36 CST 2018
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last visit: Fri Oct 3 23:53 CST 2014
[RELATED]

Finally got this finished. I hadn't forgotten about this thread.

I ended up drilling out the hole (10.5 mm I think, or 10), and tapping it to 12mm (or 12.5, don't recall) and putting in an insert for the bolt.

that seemed to work fine.

However, I do have an issue. Here are the deets:

The car sat for 7+ weeks.
I drained the oil, and re-filled it.
changed the timing belt and serp belt.

Now the car seems to sound a little louder than it used to. A louder valve click/clack sound.

I have read that these engines are known to have issues with the valves sticking/clicking if unused for 10+ days, and that it should just settle down once the engine gets to running temperature (but I'm not able to do that right now). So I'm hoping that is the issue and I'm totally over-reacting.

But, this caused me to think back to the last time I (foolishly) changed the timing belt on this car. I totally mucked up the timing, by not having all 3 marks lined up. This created an OBVIOUS "red alert" sound when I tried to start it (which is absent from this experience, thank god).

So this time, I was much more diligent with the timing markings. In fact, I re-set it 3 different times because I wasn't happy with things.

But the timing markings, after 2 cycles, seems to be off by like half a tooth (at most) on the cam sprockets (so about 1/4 tooth on each one is the lower marking is correct).


Is that enough of a difference to fubar the exhaust and intake valves?

--
1985 245. 246K Gone..but not forgotten. Sold in 2013, found 2018! Still running on the road. Of course.






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