Camshaft sprocket locating pin?

motman · Postby **motman** » 12 Nov 2013 17:23

Once again I'm in need of some expert TR7 help.
I mentioned a while ago about my 77 2.0litre TR7 making a tapping noise which I suspected was the timing chain. I have finaly got round to taking the rocker box off and having a look, the first thing I spotted was a bolt in the centre of the camsprocket which is rattling about loose. I believe its called the camshaft sprocket locating pin, it wont tighten up and has clearly been hitting the plate infront of it.
Any ideas if its a common problem and more importantly what the fix is?
Cheers

Steve

Beans · Postby **Beans** » 12 Nov 2013 18:01

Remove the bolt immediately, it should only be fitted when removing the camshaft, to support the cam sprocket.
You're lucky that it didn't come of and ruined your chain
Support bracket should be free from the cam sprocket, as this picture shows ...

1976 TR7 FHC (needs some TLC ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

motman · Postby **motman** » 12 Nov 2013 19:10

So some pillock has left that in after doing some engine work?
Oh dear, that casts serious doubt over the quality of work that has been done!
I did try to remove it but its not for coming out. Now I'm very worried about my engine......

Thanks for the info Beans, much appreciated

Beans · Postby **Beans** » 12 Nov 2013 19:19

He could have forgotten to remove it after work, happened to me once [:I]
I was Lucky to notice I was missing the nut in my micrometer case, where I always store it, so no harm done.

<center>

1976 TR7 FHC (needs some TLC ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

Workshop Help · Postby **Workshop Help** » 12 Nov 2013 20:15

If you would, pretty please, take a photo of this disaster in the making. I'm having trouble visualizing it.

Mildred Hargis

john 215 · Postby **john 215** » 13 Nov 2013 04:52

Hi,

How it SHOULD NOT look -

The nut is the same size thread as the cam bearing caps, I would check they are still present [:0] [xx(]

Cheers John

LIVE LIFE A QUARTER OF A MILE AT A TIME!

1976 Speke FHC Beauty Now with an overdrive conversion

1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!

motman · Postby **motman** » 13 Nov 2013 12:18

I will post a pic later but I have spoken to S&S as I cannot get the bolt out and they tell me its part of the cam gear thats come adrift. Looking at the pic of Beans its the center part of the cam sprocket, the threaded bit with the nut on you can see sticking out, its this that is loose.
It seems this should be tight up against the sprocket and the locating tool fastens to it?

Beans · Postby **Beans** » 13 Nov 2013 13:39

Sorry misread your initial post, thought there was a nut + bolt screwed to the support bracket.

The "nut" and "bolt in my picture both are not what the appear to be;
â€¢ The bolt is a dowel for centring the sprocket to the camshaft.
â€¢ And what looks like a nut isn't treaded but press-fitted to the dowel to keep it in place.

As it should look from behind with the cam shaft removed ...

1976 TR7 FHC (needs some TLC ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

motman · Postby **motman** » 13 Nov 2013 14:24

In that case its the dowel that has come adrift and is rattling about. Looks like its going to be a full chain off, camshaft out stripdown.
i just hope I can save the cam or S&S have a good used one as I don't want a repo item on it

Neil_W · Postby **Neil_W** » 13 Nov 2013 17:22

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by motman

In that case its the dowel that has come adrift and is rattling about. Looks like its going to be a full chain off, camshaft out stripdown.
i just hope I can save the cam or S&S have a good used one as I don't want a repo item on it
<hr height="1" noshade id="quote"></blockquote id="quote">

Robsport has some new old stock camshafts a while back - they were about Â£30 & just needed a polish of cams - they may have some left [?]

nick · Postby **nick** » 13 Nov 2013 21:19

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by motman

In that case its the dowel that has come adrift and is rattling about. Looks like its going to be a full chain off, camshaft out stripdown.
i just hope I can save the cam or S&S have a good used one as I don't want a repo item on it
<hr height="1" noshade id="quote"></blockquote id="quote">

Not so fast. My recollection is that the nut does not tighten snugly. Take a look at this drawing before you do anything drastic.

http://www.rimmerbros.co.uk/Item--i-GRID006038

[img][IMG]http://i615.photobucket.com/albums/tt234/nickmi/TR7%201975/Yellow.jpg[/img]
nick
'79 TR7 DHC
'76 TR7 FHC

motman · Postby **motman** » 14 Nov 2013 05:40

On the drawing its 149787 that is loose but its not just the nut, its the whole thing. The plate in front of it has also taken a beating and is now very out of shape. As the dowels only function appears to be to hold the chain assembly on head removal I think I could probably do away with it but I suspect the only way to remove it is going to be to remove the chain and timing gear.

motman · Postby **motman** » 14 Nov 2013 09:24

[url="http://s31.photobucket.com/user/mot-man/media/P1030398-Copy_zps3dbd0636.jpg.html"]

[/url]

Neil_W · Postby **Neil_W** » 14 Nov 2013 12:06

Have a look at the Work Manual Page 86 for more details on the bolt - temp. measure 'cut it off' ?

http://www.tr7.co.uk/pdfs/TR7.pdf

Beans · Postby **Beans** » 14 Nov 2013 17:24

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by motman

On the drawing its 149787 that is loose ...<hr height="1" noshade id="quote"></blockquote id="quote">
Looks much the same as the one on my (Sprint) engine)
Bracket is bend a bit, but that shouldn't matter much,
as long as you don't need it to mount the sprocket wheel.

<center>

1976 TR7 FHC (needs some TLC ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

Anonymous

Camshaft sprocket locating pin?

Camshaft sprocket locating pin?

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