MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey Car Information.

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGF Technical - Cam pulley bolts

Hi all

As some of you know, my 'f' Purple Haze suffered cam belt falliure,

update........

Im fitting a brand new TF135 head, however the cam pulley bolts on my original head were 8mm and the TF135 heads are 10mm subsequently the holes through the pulleys i have are 8mm so i am having to have them precision drilled to 10mm and find some 10mm bolts and washers!!!

Not happy as noone told me of this, so causing a pain now im trying to put it back together!!!!I wanted it running today!!!!

Anyone come across this or resolved it if so how???

Rick
R P Earle

Rick, I have to say that I didn't come across this problem when I upgraded to the TF135 head - but then the head I received came complete with cam pulleys...

How have you over come the manual v automatic tensioner problem on your engine?
Rob Bell

glen has given me an auto one to fit, i hope it goes on???!!!! does this work in your experience???
R P Earle

The problem is that the cam belt with the autotensioner is wider (and longer?)- which doesn't pose a problem with the cam pulleys (which are the same for both manual and auto-tensioner engines), but is a problem for the crank pulley.

When I had my TF135 head ported, I asked Dave Andrews to drill and tap the head to take a manual tensioner - a step that removed this particular headache for me.

Dave has a template for doing this whilst the head is off the car. But if you are now back at the stage where the head is now fitted to the engine, you probably won't be in the mood to strip things down again!!! I have no experience with an autotensioner and a 'manual' cam belt... :o/
Rob Bell

I'll see what happens?????

Tried to ring mike today but got no answer as ususal???!!!!;)

Just spoken to glen, in belgium, he is going to drill another new head to take a manual tensioner and find me some tf pulleys if he can and we are going to swap again somewhere on the m25??!!!!!!!
R P Earle

Hopefully the exchange of parcels will go well Rick! LOL

Which Mike were you trying to contact?
Rob Bell

Could someone please update me on this : 8mm cam pulley bolts on an "F" engine head ???? I thought these small bolts were on pre-historic early Rover cars only and never used on any "F".
Rick, what was the thing that made the total failure of the head ? Actually a snapped belt ? (still after all these years only seen one,a Golf diesel where the belt had a clear cut )or waterpump/tensioner/cambolt ?
Hope you get it sorted a.s.a.p. / Carl.
Carl

Carl,

On my original head, my car is no 72 off the production line a non vvc, the cam pulley bolts have an 8mm thread and the hole through the cam pulleys is big enough to take only the 8mm bolt.

On the tf135 head i have the cams take a 10mm pulley bolt and hence i cannot get this through the cam puleys, hope this explains it??!!

Also the engine failiure i suffered was due to the cam belt tensioner bearings going and the outer tensioner ring/pulley came of the inner one and cut through the cam belt cover!!!!

See my pics on this thread!!!

http://fregister.proboards37.com/index.cgi?board=general&action=display&thread=1144955152

Rick
R P Earle

Nasty pictures ! Still not sure why you have 8mm bolts despite an very early car.Do you know the history of the car ?Ex-Rover press car? HGF at an early date and just changed the head from an older K-engine?
Would be nice if Dieter or Mike could confirme that there actually were non VVC cars with those bolts fresh from factory.
If the locking pin mates OK and it is just up to the size of the hole it would IMO be possible to enlarge to 10mm and re-use the old pulleys. But for sure it has to be done in a lathe (sp?).
Carl

Glad you said that Carl - I was thinking that it was unlikely that any MGF was ever sold with anything other than 10mm cam bolts: certainly my car (approx 2000th off the line) came with these.

Machining the original 8mm cam pulleys is a specialist job: you don't want to have the hole even fractionally off centre. A lathe at a specialist engineering shop is the way forward I think - but easier to buy a pair of pulleys! :o)
Rob Bell

The car has had hgf prior to me buying it, as it already had the metal dowels and had the pulleys marked up, i have the full history of the car, every receipt, every tax disc and every MOT cert from two years old............nothing mentions a new head????

Glenn has told me that i may get the second MODIFIED new head TOMORROW, yipee!!!! So may have it running tomorrow!!!!

Cant wait

Rick
R P Earle

Good luck Rick - remember to take lots of pictures! :o)
Rob Bell

Cheers mate!!!
R P Earle

This thread was discussed between 28/04/2006 and 02/05/2006

MG MGF Technical index

This thread is from the archives. Join the live MG MGF Technical BBS now