Water pump bolt warning.

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#21

08-14-2021, 01:13 PM

crbass

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Quote:

Originally Posted by astromorg

Adding some thread is a sensible, practical solution in a situation like this, but when stretch bolts are involved, I would suggest that the OEM threads will have been rolled to form, not die cut. Die threading an extension in those circumstances would likely create some potential stress points that could result in in tensile or torsional failure on stretching. Not so good!

Perhaps, and perhaps if I had stretched them. Kept @ 8 Nm. No leaks right now. And frankly, it’s 8 Nm. The one part design does not seem as inherently leaky as the two part.

Bottom line, no apparent jag replacement was in near term view. And I didn’t like any of the ‘sturdier’ alternatives.

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#22

08-14-2021, 03:36 PM

michaelh

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Quote:

Originally Posted by crbass

Kept @ 8 Nm. No leaks right now.

That works fine for me, too.

I concur with Jon that it seems overkill in this location. Doubtless the Jaguar metallurgists think differently.

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#23

08-14-2021, 05:11 PM

crbass

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Quote:

Originally Posted by michaelh

Slightly OT, but what is the reason for replacing the bolts?

I re-used the originals when I did the job. I didn't RTFM properly, and just torqued them up to the stated 8Nm rather than the JTIS spec of 8Nm +90°.

For me, I generally do this. Less heartache.

Here, a practical issue too. I had to ‘bolt extract’ three of them. There’s also the issue of the stretchy bolts.

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#24

08-14-2021, 05:40 PM

michaelh

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OK, in that case, you have no choice, but (wandering further OT here) otherwise what's the issue if you don't try to stretch them more than once?

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#25

08-14-2021, 06:08 PM

crbass

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Quote:

Originally Posted by michaelh

OK, in that case, you have no choice, but (wandering further OT here) otherwise what's the issue if you don't try to stretch them more than once?

I personally would think that the risk is small under those circumstances in the exceedingly unlikely event (for me) that I get one of these tiny head bolts off after the last gorilla haphazardly tightened it after the previous gorilla helpfully rounded it off.

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