My XJR-100 currently has the large stage II pulley on the bottom and I'd like to put the original balancer/pulley back on. From what I've research this seems not as easy at would seem from just looking at it. Anyone with any advice who has swapped out the balancer? Easy, hard, pitfalls, parts needed. Thanks in advance.

 

Apparently, it is easier than the upper.

a) obtain appropriate factory belt. (there are two to pick from depending on revision)

b) remove and replace pulley as if you were changing the primary chain tensioners
and guides

Unlike the upper pulley, there was no grinding, etc. to do the installation.

Wanna trade? Send me a PM

 

I have the original pulley/balancer and belt. From what I can see the larger pulley doesn't perform as a "balancer" like the original which concerns me.

 

Not quite sure what that means (I know what it means, just never did it) as I've just got the car so I've Performed no maintenance on it. My others an X300 and XJS 5.3.

 

Motorcarman describes it quite well in several posts.

The gist is that the modified pulley comes off and the
original pulley goes back on.

There is a special puller, but not everyone uses it.

Others use a three legged universal.

The bolt is threadlocked and there is a locking cone.

For red loctite, the permanent stuff, loctite says to
apply heat first.

You'll need a new bolt per Jaguar procedure/recommendation.

Once the bolt has been loosened a few turns, apply pressure
with the puller, give it a tap with a mallet on one edge.

This tap is intended to let the puller partially walk the
pulley forward. Once the pulley has moved a bit, applying
pressure by hand on one side while tapping on the other
side usually walks the pulley forward the rest of the way.

 

The larger pulley is bolted to an oem harmonic damper - at least on all the ones I've seen. This would mean doing a big job that requires not only a pulley puller but a F big torque wrench and pulley locker to get the correct load on the new bolt. Have you a picture of the pulley?

The 100 motor has the later metal timing parts and chains so no need to worry about plastic timing parts from the earlier revisions. Or doing the job!

If the car is running fine then I'd suggest keeping it on.

 

So I have to ask.. Why do you want to take it off? Are you having issues?

 

I'm not sure which ones you've seen but the stock balancer is basically one solid piece and would virtually impossible to separate the two pulleys and add a larger outer one.

 

no "issues" just tossing around keeping it stock and ensuring the lower/larger pulley is also an actual harmonic "balancer"

 

Also IIRC jaguar never put "metal"' tensioners on the steel body XJ8/XJR series, just uprated plastic ones with springs, better but not a cure all.

 

My 02 XJ sport had metal tensioners.
Engines mfg dates after I believe it was August 2001 had metal tensioners.

 

The tensioners I mentioned were the lower tensioners
behind the timing cover. Nothing to suggest there is
anything wrong with them, but only to reference which
job is associated with removing the pulley so that JTsmks
could search for descriptions of that job.

The aftermarket pulley as sold is a single assembly. The
outer ring can be exchanged for different diameters.

But as received from the vendor, it is a single unit and
installs with a single bolt just like the stock item.

If it were myself, and I had both sets, I would tend to
leave well enough alone until I had a chance to study
what effects not having the rubber ring might imply.

In my opinion it smooths out the forces for everything
beyond the crank. So it would not have any effect on
the engine itself except for perhaps letting the crank
operate somewhat independently of the other driven
masses when it "pulses" due to a piston firing.

 

Thanks for all the input from everyone. I found out pretty quick this is basically the same engine that was in my old 02 Lincoln LS. And the chassis is pretty much my X300 with some styling changes. This car has very low milage (45k) and my thoughts are to take it back to stock. I found out today my gas gauge is off so now I'm going to focus on some of the small niggly things before diving into the pulleys. ( anyone care to chime in on the sending unit?)

 

The use of an NA crank pulley and an alloy 10% pulley is bolted onto it via 4 bolts, Paramount, Powerhouse TL, Arden.

But hey, what do I know...

Uprated pulley installed here, not talking about the stock one.
https://www.jaguarforums.com/g/picture/2653418

 

Just looked up the powerhouse one where they are actually cutting the stock damper in half and mating the new pulley to it. The one on my car came as a complete set which removed the complete stock unit and after looking at the rearward pulley on mine it doesn't appear to be rubber isolated nor balanced. I could be wrong and it'll take some further digging to be sure. Wasn't trying to say you were daft Sean, just seemed like a long way to go to cut that thing in half (which now I see some are) and to be frank, some aren't. I'm trying to be sure weather mine is or isn't.

 

Yup.. Those are the only lower pulley upgrades that I have ever seen.. I had no idea they made complete lower pulley sets, like the OP has installed on his 100.

 

Wrong, sorry. Any Jaguar with an engine number after mid August 2001 as already mentioned by Convictor will have metal timing chain tensioners and guides, along with Morse chains, they also have steel liners. They suffer from non of the earlier AJ26 issues.

All XJR/XKR 100 cars have the AJ27S engine with 4.2 timing gear from the factory. They are not an LS Lincoln unit, having been built in Bridgenorth at Jaguar engine plant. Ford shared the design, and that particular unit shares more in common with the XJ8. Some parts will fit.

I've yet to see a billet double pulley, so if you could share a picture of the one fitted to your engine it would help.

The fuel sender is accessed from the top centre hatch, the tank needs to be unstrapped and tilted forward to access, a soft hammer and flat driver to knock-turn the hatch open.

 

after closer inspection the unit on my car is a damper cut down, the confusion factor stems from the original damper coming with the car which in retrospect the unit on the car had to come from a donor car. I'm no XJ8 expert NOR an XJR expert, I have been working on Jaguars (5.3, 4.2'6 and AJI6) for some 20 years, this is my first venture into the Jaguar V8 world and I was very clear that in my statements to say things such as "IIRC" my knowledge of these cars is growing and I'll ask all I can. I'm not here for condescending responses or defensive snip its. I'm trying to learn and get to know the car. I add quit a bit to the XJS forums and X300 forums and would like to do the same here. If you feel I've been condescending or defensive simply say so BUT if you feel the need to prove yourself right at the cost of pushing someone else's limited knowledge down then keep your opinions and advice off my thread, I'm good without it. Valuable information is always desired and that should be given without the "know it all" attitude. I admitted I was wrong in my assumption the pulley was "billet" (not my term, someone else's) and I'm sure I'll make more mistakes as I dig into the car.

 

How about you read your own words and take them on board mate?

Ok, I've been on this forum a long time and when someone states something that isn't correct I'll interject and clarify for all members. These comments are pointed at me then fine I will not offer advice in future on your particular threads, I've already told you how to fix your fuel sender and you throw your doll out the pram!

 

Thanks Sean, exactly the reply I expected.