Timing Chain Tensioners: A comparison

[xvivalve]

With regard the Jag tensioner it is early XJ6, but you may encounter the same issue we have in that when you ask for the part by number or name you will be supplied with an aftermarket version with the same poor quality construction. There are Jag specialists who stock the OE part, but they'll charge you handsomely for it, in some instances £50+

I currently have a couple of OE Jag ones by me that I will happily pass to members at cost, ie £31.20

[Jon Tilson]

I would say in Polly's list that items 1 and 3 warrant further investigation and item 2
is the Roland one that is to be avoided in Sprint applications.

I may well write to the supplier to ask his views on its use in Jags...

Jonners

[xvivalve]

Roland? You mean Rolon?

I didn't see Polly's post before my previous one, odd, as it was posted 10 minutes before.

At those prices, I suspect from my investigations through the trade, that even naming the part or giving the number you will end up with a copy version. This is only one example where we are victims of parts buyers' desire for maximum profit.

[SprintMWU773V]

I thought I'd check my stock.

I have a Jaguar one (Renold). This one has a small hole on the body and no hole on the slipper pad.



The one fitted to my car and removed was a Renold with no locating dowel and no visible hole on the slipper pad. It must have done some mileage before I stripped the engine down with no issues.



I also purchased another Renold one a year or so ago, again a Jaguar one. This one has a locating dowel and the slipper pad also has a small hole in it. This seems closest to the original Dolomite type one?



I have a Rolon one too but s the consensus is that these are s##t I didn't bother to look.

[PaulB]

Have a look at the side of the piston under the slipper pad head. On the ones without the hole in the slipper pad, you should find a very small hole. I suspect this has two purposes. It provides an bleed for the oil feed preventing air locks and also an oil supply to the chain.

[dursley92]

Just out of curiosity I ordered the EAC3629 one from BritshParts and this is what came, they show the part number as supeceded. Its flat on the back with no dowell:-



Doesn't look too bad though and its says Made in France on the box. Do we believe it?



And just to muddy the waters further how does the Austin Healey part no.011-139 and the MG part 12H3292 compare?
I just ordered an MG one from Leacy MG total cost including post of £13.20, we will see what turns up. They also list a very cheap repro one.



------------------
Update: Leacy Classics 12H3292 just arrived.

[James467]

Here you go, this is an original 12H3292 it has a dowel and hole in the slipper pad.





James

[Jon Tilson]

The other crucial thing with these is how does the ratchet and spring bit work.
e.g. if the internal peg breaks off on the ratchet bit then the tensioner will go loose with no oil pressure.....

Jonners

[trackerjack]

The other crucial thing with these is how does the ratchet and spring bit work.
e.g. if the internal peg breaks off on the ratchet bit then the tensioner will go loose with no oil pressure.....

Jonners

Surely not ...............its not hydraulic, is it?

[Jon Tilson]

Lol....

The conclusion was that it was partially hydraulic I think, or should be....and the ratchett stops it rewinding
as you your good self pointed out....and convinced us.

Jonners

[Mad Mart]

Lol....

The conclusion was that it was partially hydraulic I think, or should be....and the ratchett stops it rewinding
as you your good self pointed out....and convinced us.

Jonners

[soe8m]

Lol....

The conclusion was that it was partially hydraulic I think, or should be....

Jonners

I alway's thought this conclusion was your own first step of accepting.

Jeroen

[xvivalve]

As I've pointed out in the past, you cannot rely purely on a part number, even with the Jag items, as they too are being superseded with copies.

[soe8m]

I know Vin Diesel has some NOS lying around.

Jeroen.

[Jon Tilson]

I'd want a hole in the slipper pad for the oil to lube the chain myself....

Cant be hard to run a drill up it.

Jonners