Pulled out my engine today

[Melvyn Best]

The lower tensioner with the curve , on incorrectly? It looks as if it is forcing the chain away from the sprocket , the chain shouldn’t put any strain on the guide like that, it’s likely to break

 

[RaceDiagnostics]

does the old one draw back further into body then

If anything the new one draws back further, the plunger moves back about 1cm.

 

[RaceDiagnostics]

The lower tensioner with the curve , on incorrectly? It looks as if it is forcing the chain away from the sprocket , the chain shouldn’t put any strain on the guide like that, it’s likely to break

On upside down, possibly. Off to check old pics, back in a mo.

 

[RaceDiagnostics]

Nope.

 

[8ob]

I think you are just doing battle with the spring in the tensioner, may be worth drawing it in carefully on longer studs and them swap them back to bolts one at a time.

Bob

 

[RaceDiagnostics]

I think you are just doing battle with the spring in the tensioner, may be worth drawing it in carefully on longer studs and them swap them back to bolts one at a time.

Bob

Good suggestion, but the "new" tensioner has actually been on the engine for about 6 months and I didn't have any problem putting it on. With the chain connected the plunger on the tensioner would have to be forced right back into its body, something would break first.

 

[Melvyn Best]

I would try removing the cap on the old tensioner, pushing the piston out and refitting it from the cap end of the body after connecting the chain and refitting the tensioner , nothing to lose by trying it. The picture of the tensioner peg doesn’t look like the parts diagram, ?

 

[RaceDiagnostics]

The parts diagram covers lots of versions, when you put in your VIN, it then lists only the the parts numbers of the actual part on your and various parts in the pic are not referenced.

 

[jpmillermatic]

are the parts for the tensioner plunger on correctly?....you said it should not be sticking out like that. Its probably the picture, but the old tensioner post looks shorter than the new one...but that is mute because of the stick out on the tensioner plunger.

Did you measure out both chains lying them next to each other for a comparison? if the links are the same dimension and the link count is the same...well, its not that either!

dang....it sounds like a spring is not fitting inside a bushing correctly on the tensioner, or something needs to index properly so that plunger sits where it should.....

JP

 

[roofman]

Get the old tensioner in a vice and see if you can get it back in the holder..i know you said the new one was fitted 6 months ago but the only parameters that have changed is new chain and slippers, this combined could have a big effect on spacings plus trying to push against the spring as bob mentioned,Try slacking the oil feed back nut off before you insert the tensioner as it looks like those small ball bearings sit in a seat similar to an offloader valve and the plunger could be hydro locked with oil....

 

[dobbslc]

In this photo the guide looks like it's holding the chain off the sprocket,

Part number 98 I think,

Is it the right way up?
It could just be the angle of the camera but it doesn't quite look right.

 

[dobbslc]

Hang on is it on the wrong side of the chain?

 

[zx9]

Hang on is it on the wrong side of the chain?

It would appear to be drawn differantley to the one shown in the photograph.

 

[dobbslc]

The guides on the right hand head (as you look at it in the photos) go either side of the chain run not both to the right, look at the chain run in the diagram, it pulls right round the sprocket but with the guide where it is it's not wrapped far enough around the sprocket. I can't explain it very well!

 

[roofman]

The guides on the right hand head (as you look at it in the photos) go either side of the chain run not both to the right, look at the chain run in the diagram, it pulls right round the sprocket but with the guide where it is it's not wrapped far enough around the sprocket. I can't explain it very well!

 

[roofman]

It would appear its on wrong on the engine..good spot

 

[8ob]

I think he has the guides in the right place, it appears to be a chain length or a tensioner problem. Personally I would be compressing the tensioner before I started ripping things apart.

 

[dobbslc]

Mmm looks the same as you've posted Bob, maybe the diagram is wrong then

 

[RaceDiagnostics]

It's just a parts diagram, doesn't show correct positioning. I've currently got the old chain fitted so it's not the chain.

I'll try both tensioners in a vice tomorrow.

 

[Melvyn Best]

As I said in an earlier post I had problems with an old Mercedes tensioner, in the end I found taking the piston out and refitting from the opposite end of the tensioner sorted it out.