XJ XJ12 ( X305 ) 1995 - 1997

Time for a Harmonic Balancer Rebuild

 
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Old 05-18-2018, 02:43 AM
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Default Time for a Harmonic Balancer Rebuild

The squeal was occurring at every start-up last two weeks. Very un-Jaguar like! The alternator would not get charge voltage until the "catch" of the bonding a few seconds after start. I had some concerns about removing the balancer on the V12, but all went well.

The giant 1-5/16" bolt came loose using the starter bump method... at the fourth try! The pulley came off easily with a standard screw-in puller (not a jaw puller). The radiator did not need to be removed. The bonding layer was visibly cracked after 23 years and 96000 miles. No surprise there.

The balancer is on its way to Dale Manufacturing in Oregon. Excellent reputation, good price, lifetime warranty, two day service. I learned that his operation closes down four months out of the year, including June. So I got lucky with the timing! Updates to follow.
 
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Old 05-19-2018, 12:28 PM
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Something else to add to my list of things to check. Thanks
 
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Old 05-20-2018, 02:24 AM
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I have one to do also. Let us know how it turned out.
 
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Old 06-08-2018, 04:45 AM
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Default She's back on the road.

All went well with the rebuild. Just finished all the work. The only real pig was to find a way to hold the damper still while tightening the bolt. I made do with a pulley holding tool that didn't really hold all that well (it is supposed to grab and hold at the edge of the pulley). I'm sure the torque is not up to spec of 180-220 N-m! I may have to revisit that bolt.

The service manual says to "fit a suitable wedge to the drive plate" (at the transmission) or use a "pulley lock service tool" for immobilizing the damper. Who knows about the tool, but maybe there is access to the drive plate from underneath. I didn't check for that. Any advice?

Also I learned after the fact, that the pulley is a two-piece unit and only the innermost section (for the alternator belt) has to be rebuilt. I unnecessarily sent the entire thing to Dale's. Oh well. Glad it was flat-rate shipping!

In total it was a two week turnaround for the damper job, plus some more time for work on the cooling system, replacing some hoses and such. Happy to be finished for now and back to cruising in style.
 
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Old 06-17-2018, 10:53 PM
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Yeah, I've got a startup squeal right now that is yet to be determined loose belt or damper. I'm hoping it's the belt, but we'll see.

Is the test similar to the AJ16 engine damper, which is to paint a white stripe across all the pulleys to see if it remains aligned? Or is there another method to determine if a V12 damper is slipping while still on the car?

What's the cost for the V12 damper rebuild?

.
 

Last edited by al_roethlisberger; 06-17-2018 at 10:56 PM.
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Old 06-21-2018, 03:47 AM
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You can certainly paint the stripe across the pulleys, although it is not nearly as easy to reach or to see as on the AJ16. I didn't bother with marking it, I could tell what was happening from the noise and how it coincided with a temporary lack of charging. I had already checked the belt tension and tightened it a bit, but the squeal got worse and became more frequent, occurring on both cold and hot startup.

Dale's is a lot cheaper than Damper Doctor. Dale's starts at $130 (which was my cost) plus shipping both ways, in a medium Priority Mail flat rate box, $13 each way. I insured mine for $500, even though that wouldn't help if it got lost!

Dale's website: new home page H.B.

What's with this new font in the reply box?? It is too small and too light. Now I have to zoom my screen. Ridiculous that even though phone, computer and TV screens keep getting bigger, text keeps getting smaller. I can't even see the period! Stupid!!!
 

Last edited by SleekJag12; 06-21-2018 at 03:48 AM. Reason: Added info
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Old 06-22-2018, 07:54 AM
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Question

Do you know if the specs (bolt size, torque) for the 6.0 V12 is same for a 1994 XJ40/81 V12 as the 6.0 V12 in the X305?

And do you know if the "starter bump" removal method works just as well on the V12 XJ40?

I assume the engine is essentially if not exactly the same, so "yes", but just checking.
 
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Old 06-25-2018, 03:53 AM
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The bolt size is 1&5/16". I recently saw this big socket, 6-point 3/4" drive, at Lowe's for about $20 or so. I was looking for a puller which they didn't have.

The starter bump method should work fine, but only bump the starter for one second. If the bolt doesn't turn first time (and come loose, allowing the engine to turn over), wait a while before trying again. A huge amount of electrical heat will build up in the starter real quick if the bolt won't come loose.

I'm learning that there are quite a few subtle and not-so-subtle differences between these V12s. I'd say the XJ81 V12 is more like the last-gen XJS 6.0 V12.
 
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