The Triumph Dolomite Club - Discussion Forum

Hello all.
Last year I replaced the timing chain on my Sprint. It has been running well since. Last night I took off the cam cover to have a brief inspection. I notice that the cam sprocket bracket is not aligned to the sprocket?
When I changed the chain, I didn't need to use the bracket, but in future I may remove the head.. So will need to utilise the bracket to hold the sprocket and keep chain tension.

I'm sure I refitted correctly and don't remember there being any adjustment for this bracket.. Just two bolts.

Anyone have any idea what I may have overlooked?

Many thanks.
Matt.

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Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU

Is there any movement in it? An obvious answer would be one bolt dropped out and it has rotated about the other...

No movement at all Alun.. Very odd.

_________________
Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU

Is it the wrong bracket? Wondering if an 1850 or TR7 one has crept in maybe?

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Russ Cooper
Dursley
UK

Quite possibly Russ. The engine has had work in the past. I had a look earlier and the Sprint and 1850 do have different brackets.. So quite possible.

A nuisance that will be though.

_________________
Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU

The 1850 and Sprint brackets are not interchangeable. Your problem is caused by the bolt holes in the bracket having a generous clearance. This allows the bracket to rest to one side as you tighten. I find it necessary to ensure alignment before final tightening when building up after fitting the chain.

BobM

I can't think of any benefit (or for that matter detriment) until such time you need to remove the head, at which point remove the timing cover prior.

I think the risk of tearing the sump gasket would prevent me touching it until I need to...

Thanks Bob for confirming this - you live and learn!

The head may come off at some point for inspection as it is very 'clattery' at the top end, so I can address my misalignment then. A nuisance, but one of those things.

Thanks for the advice - always appreciated.

BW

MC

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Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU

Hi,
Sorry Matt. Just looked properly at your photo. I believe it can only be that far out by having one of the two bolts missing. Which also suggests one of the two chain guides is only secured with one bolt. That said, I would expect with a little leverage the bracket would rotate. the excessive clearance I spoke of allows only about 5/16in movement.

Unless a hard setting sealant has been used, the sump gasket should remain intact when removing the front cover. If it breaks dropping the sump is a pain but possible.

You say the top end is noisy. Is this tappets or more of a knocking. The cam sprocket can slacken despite the tabs. The two 1/4in unf set screws are some what marginal for powering 16 valves.

Morning Bob. Thanks for your ongoing thoughts on this one.

I know the bolts you refer to. There are two and they bolt this bracket and also the top chain guide in place - I am sure both are still in place and definitely refitted the two when I did the chain.
The bracket really is solid, I've put a small pry bar through to see if there is any movement, and it doesn't move at all.

I have ordered a bracket from Rimmers. As they are less that £10 and look NOS, I thought it would be useful to be able to compare against the one fitted to my car. Who knows if someone has deformed it in the past for some reason?

The noise I refer to is very much a 'clattery' sound. Initially, I thought it was the chain - hence the replacement, but following refit, it hasn't made any real difference, although possibly a bit quieter at idle. The original chain did have some stretch however and the tensioner was fully extended, so the replacement wasn't a totally wasted task.
The valve clearances seem fine, so I think it is possibly the buckets, or worn valve gear. I am hoping Mad Mart may be able to take a look sometime for me when he is able.
Richard Old and I checked the oil pressure recently and that was good. I intend to check the compressions too when I get a moment.

Aside from the clattering, it runs nicely.

I did post this on the club F.B page, and some of the group quite correctly pulled me up on my tardiness regarding the tabs. I have since made sure the bolts are still tight and peened over the remaining tabs.

I will keep you posted on this one!

Kind Regards

Matt.

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Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU

It seems the bracket must be distorted.

BobM

You only need to peen over one tab per bolt. The idea is the tab washer can be reused, using a different tab each time you remove it.

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Sprintless for the first time in 35+ years. ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450

I don't think it is Dave. One side is flat (which sits on the block face) the other is flanged, I guess for rigidity?

_________________
Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU

That makes me feel a bit better Mart - The one I took off only had one tab peened over, so I just replicated that on refit.

_________________
Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month


1980 1500HL - OPD
1976 Sprint - SWU