I have just replaced my timing chains and sprockets and the new type tensioners have pin hole size oil ways compared with the larger oil feed as before. I have enquired about the efficiency of these and have been told that they have been modified for several years now and should improve oil pressure. Have to wait and see.
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Bob,
The expert on this is Mike Wattam, formerly of the SOC, now of the Triumph Stag Register. He has posted many times on this subject on the Stag Digest, having done exhaustive tests of chains andtensioners. I'm not sure how good the archives are on the Digest but you may be able to reach them via Triumphstag.net.
It is my understanding too that they have been modified for several years, but for what reason is unclear, possibly to make them easier to manufacture in India rather than to increase oil pressure. You may be better to use our old tensioners if they are genuine BL items and are servicable. But check the archives before 'waiting and seeing'.
Ray
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Ray
The new type tensioner has the oil outlet from the top of the piston, under the foot and pre oils the chain before it passes the footWhereas the original ones had a hole in the foot and the oil serviced the chain from there. My only concern in that the pin hole feed could easily get blocked, but I will get a few thousand miles out of it before any tell tale signs of it not working.
Bob
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Decided to take tensioners back out and use the old holder with the new foot, seems a better system.
Bob
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The new type tensioners are now fitted, the oil flow viewing from the oil filler cap before was a river now with the new type it seems to run quite dry. If anybody has done the chains/tensioners over the last couple of years, how do yours compare.
Bob
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I didn't even look at mine, got me thinking now. I notice you show two types of back plate, from memory the one on the left is the replacement sometimes supplied with new bits, the one on right with the bent end possibly an original, I've got these on my current engine. I mention this because I think the step is a good idea, one of my adjsuters was at its limit, hitting the stop. If it hadn't been there, I reckon the adjuster would have popped out along with a few other bits of the engine. This probably accounted for the noise as the adjuster wasn't taking any more slack out of the chain and gave me warning.
Paul
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Last time I changed my timing chains, abouteight years ago,I re-used the old original styletensioners rather than use the ones in the kit. I didn't think the new design would offer the same degree of lubrication. They have covered about 70,000 miles now so I guess they will need changing next time but I will just replace the feet with some spares I have.
I remember seeing a videoa while back, probably on triumphstag.net, that showed exactly what Bob has described. I'd rather have the higher flow of lubrication thanany possibleimprovement in oil pressure.
Pete
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There are two videos that compare the oil flow around the chains with the oil filler cap removed. The difference is clearly visible, exactly what Bob describes, a river of oil v quite dry with the new. I don't think I shouldpost them here as the video’s are marked copyright Triumph Stag Register.
Personally I'd re-fit the original tensioners.I really think that SOC tooling should invest in a run of these together with the corresponding OEM chains.
1976 Triumph V8 Manual/OD in BRGComment
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Sheepdip wrote:Yep, OEM's have the step to stop the adjuster falling out completely :shock:. Why would youmake one without it.<shakes head>I didn't even look at mine, got me thinking now. I notice you show two types of back plate, from memory the one on the left is the replacement sometimes supplied with new bits, the one on right with the bent end possibly an original, I've got these on my current engine. I mention this because I think the step is a good idea, one of my adjsuters was at its limit, hitting the stop. If it hadn't been there, I reckon the adjuster would have popped out along with a few other bits of the engine. This probably accounted for the noise as the adjuster wasn't taking any more slack out of the chain and gave me warning.
Paul
1976 Triumph V8 Manual/OD in BRGComment
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Hi Nick, depends on whether you know the stops should be there or not in the first place.
The engine I overhauled a couple of years ago didn't have the end stops on the backplate and the replacement items (from one of our suppliers but honestly can't remember who) were equally void. Thus I fitted them none the wiser. But now I know from this engine.....
I guess replacements are devoid to save manufacturers cost and help line their pockets when the bits fail in a bigger way.....
ps - engine rattle has gone
but can now hear cam buckets :X.
pps - I also modified the inlet manifold waterways to see if they improve circulation - I'll let you know.
Paul
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NickA wrote:Nick,There are two videos that compare the oil flow around the chains with the oil filler cap removed. The difference is clearly visible, exactly what Bob describes, a river of oil v quite dry with the new. I don't think I shouldpost them here as the video’s are marked copyright Triumph Stag Register.
Personally I'd re-fit the original tensioners.I really think that SOC tooling should invest in a run of these together with the corresponding OEM chains.
Any chance of posting a link to the website where the videos can be seen?
Thanks
Roger
Now Stagless but have numerous car projects
So many cars, so little time!Comment
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The new ones you showare (as far as I can see) identical to the ones sold by Tony Hart. I have fitted these for owners who have purchased from Tony, on the basis that he would not sell inferior parts.
I would not advocate mixing old and new parts which may have different finishes, tolerances etc.
It would certainly be interesting if TH or another accredited Stag specialist would comment for our benefit.
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