New crankshaft pulley bolt came loose

[dunk_98]

So about a month ago i replaced my crank shaft pulley and fitted a new bolt after renting a 3/4 drive torque wrench i did it up to the recomended rating in rave, so today after having a problem with my auto tensioner and having to fit a new belt at the correct length i put my 24mm socket on the crankshaft puller bolt to hold it in place

To my supprise it started to undo, so as you can guess i was a little p.o. About this. Sp now for the moment i have retorqued it with the tools i have unsure of the setting but i defiantle believe it to be above the previous one

Now to the questions:
1. Why would it of come undone
2. Would it be ok to continue using this bolt
3. If i order a new one should i locktight it
4. Anything else you can think of

Now problems ive had at the same time that led me to find the pulley in the first place was a busted bearing on the auto tentioner pulley
I have sincs replaced it with an aftermarket on from the uk
I found after a couple of weeks the autotemtioning part became stiff to the point of i could move it to a position with the belt on and it would stay there. I believe this cause me to shread a belt due to it going loose and comeing off so i removed it and replaced it with my old one but swaping out the pulley off the new one but the new crank had been going great during this time and only found the new bolt to be loose after swaping out my temporary belt which was 20mm longer that stock with the new oem

Thanks in advance
Matt

[robbotd5]

TD5 or V8???
Regards
Robbo

[dunk_98]

sorry 1999 TD5 Manual

[alien]

I've had the harmonic fail when a adjuster seized and it grabed the belt.
If the worst that happened was a loose bolt I'd have been happy;)
IMO being a new item it held together and the bolt came loose instead

If one bearing(adjuster) has failed I'd look at any idler bearings too.
If one has failed how far away from failing are others in the system?

It is recomened to change the bolt but as it's not old I'd reuse it.
Don't use locktite either.
Also don't start it if this bolt isn't tight, it will spin the crank inside the pulley :eek:

[87County]

.
.
.Don't use locktite either.
.......... :eek:


Is that a procedural thing by the manual ?

Just like to understand why you would not use Loktite :)

[dunk_98]

I have changed the other idler pulley, also the alternator got changed 3month prior, powerstreering and aircon and fan seem fine

[alien]

Is that a procedural thing by the manual ?

Just like to understand why you would not use Loktite :)
There are a few reasons...
The manuals I've read don't list it as needed.
The bolt does up to over 440Ft/lb (unlike the dreaded oil pump drive bolt at only 18Ft/lb;)).
Being in a bad spot to work by the time you get the tourqe wrench on the locktite can be setting giving faulse readings.
Lossening the bolt next time with locktite could be difficult(it's hard as it is).
Cleaning the crank of dried loctite would be hard too( thread is over 100m into the crank).

Don't get me wrong, I use locktite all the time but this is not one of them.

[87County]

There are a few reasons...
The manuals I've read don't list it as needed.
The bolt does up to over 440Ft/lb (unlike the dreaded oil pump drive bolt at only 18Ft/lb;)).
Being in a bad spot to work by the time you get the tourqe wrench on the locktite can be setting giving faulse readings.
Lossening the bolt next time with locktite could be difficult(it's hard as it is).
Cleaning the crank of dried loctite would be hard too( thread is over 100m into the crank).

Don't get me wrong, I use locktite all the time but this is not one of them.

OK - thanks

it's just that Loktite is regularly used on the crankshaft bolt on the 300tdi and doesn't present too much of a problem

[It'sNotWorthComplaining!]

Merasure the length of the bolt, maybe it stretched, you bought aftermarket from overseas, maybe the quality was suss?

[dunk_98]

the bolt was oem land rover, just the auto tentioner and crank pulley were aftermarket