FIRST THAT ENGINE IS SCHEDULED TO USED 20-50, 2ND IT SUFFERRED FROM UPPER TENSIONER/CHAIN RATTLE. IS IT A SQUEEL OR CHAIN BUZZ/RATTLE? OTHER ISSUE IS THE RUBBER BOND ON THE CRANKSHAFT DAMPNER, IT FAILS GETS LOOSE AND CAUSES NOISE TOO

 

try looking at the alt belt and or bearings, pop the bonnet when cold and start it, give them a squirt, if it goes away theres your problem.
especially with a dip in the headlamps when you come to idle at lights etc, its a definate drop in charge, see if you keep your eye on the volt meter when comming to a stop, even the slightest movement in the needle.

 

Even in a cold climate like Chicago? I always thought that a 40 weight was preffered for an AJ16? I personally run Mobile 1 0W-40 with excellant results and no start up noise what so ever.

 

the squel sound comes from the water pump electric temperature regulator. Its a normal sickness for an X300 and X305, have it check and service and or replace.

 

20/50 in an AJ16 ? Yikes ! I use 5/30.

Cheers
DD

 

the squel is not form the oil no need to panic on that, its the heat up pumplocated on the left side front of the engine with a black plastic cover.

 

Got to remember, Brutal and I are down in Houston. It just doesn't get that cold. We use the 20-50 in older cars.

To check the crankshaft pulley, mark the inner and outer metal rings in a straight line with a paint pen. If the line separates, then the rubber in the crankshaft may be ripping.

 

I used to use 20W50 in my 3.6 Jaguar , I'm puzzled that I thought we had to use newer oil specs like 5W30 or so in '92 and on Jaguars .
I am also hearing squeals in my 1993 XJ40 4.0 liter engine . It never goes away as long as the engine runs which is slightly concerning me

 

eeeek. bump.

my new (to me, anyways) cat is doing this as well. starts up great, then about 2 mins. into warmup it will squeal pretty bad for about 30 sec then settle back down. sometimes it continues while accelerating from a stop but goes away soon as you hit 5mph or more... but the sound totally disappears when warm.. .

any consensus ? hopefully just a belt that needs tuning ? it's in the shop now, but jeez. you just don't expect a sound so awful to come from such a beautiful thing...

 

phew. got it solved. apparently before the dealer sent it out they gave the engine a good wash down and must've blasted any lube/moisture off the belt. a couple of spritzes from an $8 can of belt dressing took care of it straight away.

 

I did use WD40 prior to replacing crankcase .It worked brill as well. I was told not to spray it overtly though

 

Even though I live in az my xj6 started to do the same thing. The remedy was to fire up the car and take a green scotch brite pad tot he inside of the belts while the car was running. Now first and foremost if you are not possesing some sort of auto repair skills just take it to your local independant jag shop. If your are competetant and willing to get your hands dirty this will do the trick.

 

Crikey, I can see that lubing the belts with blood and bits of finger would also work.

Just don't try this at home.

 

I had the exact same issue with my vehicle, and this is what solved it. Before I go into details my car has had the balancer replaced along with a new belt, but it still made noise on a cold startup. My mechanic who is a jag master tech and eats sleeps and breathes anything jag suggested the following. Get yourself a scotch brite pad, and fire up the car. With the car running VERY CAREFULLY press the scotch brite pad on the inside of the belt to clean off any debris or contaminates. Just make sure that you are very careful so you dont lose a finger. My car made the same noise no matter how much wd40 or belt dressing was sprayed on it. I tried this solution and it worked great. Just make sure you are very very careful not to get a finger sucked into a pulley. Save your beers for after the job is done!

 

No offense, but who in their right mind would stick their fingers near the belts while the car is running?

If my belts squeal, I either tighten them up, or (if the previous didn't work) replace them. There's no use risking fingers or hands to try a "quick fix." Just my opinion...and I've been working on cars for 30 years.

 

AZ, sorry but your Jag Master Tech, suggested that "You" try this lethal procedure. Not him.

Then you say "be careful not to get a finger sucked into a pulley".

So what happens if you are not quite as good as you think you should be?

Barmy