Cosworth cam belt slipped
06-08-2011, 10:07 AM
#1
Cosworth cam belt slipped
Ok my tensioner nut on my cosworth has some how came off while the car was driving but at a low speed and lowish revs was checked before hand by 3 people 
Whats is the best and worst cases please peeps
I aint got the heart to lift the head off yet
We have towed the car back to my mates yard and dumped it there til I can be arsed too look again
Whats is the best and worst cases please peeps
I aint got the heart to lift the head off yet
We have towed the car back to my mates yard and dumped it there til I can be arsed too look again
06-08-2011, 10:12 AM
#2
Too many posts.. I need a life!!
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All the valves will definatly be bent 100% hopefully it won't have damaged any guides though. Good luck. You should get a thread up step by step on what you've done and find
06-08-2011, 11:02 AM
#5
You're fucked 99,9% mate, had a cambelt problem few weeks ago and all exhaust valves are bend
Take a look here
https://passionford.com/forum/ford-s...07-2011-a.html
Take a look here
https://passionford.com/forum/ford-s...07-2011-a.html
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06-08-2011, 11:36 AM
#8
i always try timing them back up first and starting them on any car and have sometimes been lucky but as said 99% of the time on cossies it will have bent the valves
i never use the standard ford nut on the tensioner i always replace it with a nylock nut
i never use the standard ford nut on the tensioner i always replace it with a nylock nut
06-08-2011, 05:20 PM
#15
Bottom end should be fine - lift the head and inspect the pistons for damage - if non it's fine, source another head, skim and fit with a new head gasket job done
Edit to say - to buy a set of valve would cost loads - Burtons do new 4x4 valves for Ł436.13
Edit to say - to buy a set of valve would cost loads - Burtons do new 4x4 valves for Ł436.13
Last edited by BRAMMER; 06-08-2011 at 05:25 PM.
06-08-2011, 08:00 PM
#18
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re time it up and then turn it over by hand to make sure nothing hits and locks up. if turns over freely then try starting it up. you may be lucky but i dought it!
07-08-2011, 12:26 AM
#19
I've found that life I needed.. It's HERE!!
08-08-2011, 01:10 PM
#24
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This happened to me also, a fair few years back, bent all the valves, one in turn dinged the edge of a piston which then left slight scoring on one of the bores of the block, ended up just getting another engine.
Hope yours isn't this bad, good luck!
Hope yours isn't this bad, good luck!
08-08-2011, 04:55 PM
#26
I dont see how it came undone if 3 of you checked it.
Might be worth getting someone who knows what they are doing involved next time rather than risk another failure?
Unlikely to have done the pistons.
Probably done the valves.
50/50 on the guides
Might be worth getting someone who knows what they are doing involved next time rather than risk another failure?
Unlikely to have done the pistons.
Probably done the valves.
50/50 on the guides
08-08-2011, 05:23 PM
#30
Not meaning to sound bitchy mate, but if 3 of you knew what you were doing how come it came loose after you all checked it was tightened? (and TBH why would 3 people check if one knew what they were doing, only takes 1 person to check surely?)
And more to the point, as im not mentioning it to try and have a go at you, but to help, what is going to be done differently next time to stop it happening again?
If it really was done up and checked by 3 people, you need to know WHY it came undone or surely there is nothing stopping it doing so next time?
And more to the point, as im not mentioning it to try and have a go at you, but to help, what is going to be done differently next time to stop it happening again?
If it really was done up and checked by 3 people, you need to know WHY it came undone or surely there is nothing stopping it doing so next time?
08-08-2011, 06:22 PM
#32
Not meaning to sound bitchy mate, but if 3 of you knew what you were doing how come it came loose after you all checked it was tightened? (and TBH why would 3 people check if one knew what they were doing, only takes 1 person to check surely?)
And more to the point, as im not mentioning it to try and have a go at you, but to help, what is going to be done differently next time to stop it happening again?
If it really was done up and checked by 3 people, you need to know WHY it came undone or surely there is nothing stopping it doing so next time?
And more to the point, as im not mentioning it to try and have a go at you, but to help, what is going to be done differently next time to stop it happening again?
If it really was done up and checked by 3 people, you need to know WHY it came undone or surely there is nothing stopping it doing so next time?
Steve
08-08-2011, 06:39 PM
#33
Like I said mate its got just a normal 17mm nut holding it and a flat washer so I am guessing its wrong
I am going to replace the tensioner nut and stud for a new 1 this time
3 people checked it as I wanted to be sure on it all you know the rest of the build was fine its wierd how this has came loose
1 question tho which way should the tensioner be turned anticlockwise or clockwise?
I did clockwise is this wrong?
Chip should I loctite it next time?
I am going to replace the tensioner nut and stud for a new 1 this time
3 people checked it as I wanted to be sure on it all you know the rest of the build was fine its wierd how this has came loose
1 question tho which way should the tensioner be turned anticlockwise or clockwise?
I did clockwise is this wrong?
Chip should I loctite it next time?
08-08-2011, 07:32 PM
#36
Like I said mate its got just a normal 17mm nut holding it and a flat washer so I am guessing its wrong
I am going to replace the tensioner nut and stud for a new 1 this time
3 people checked it as I wanted to be sure on it all you know the rest of the build was fine its wierd how this has came loose
1 question tho which way should the tensioner be turned anticlockwise or clockwise?
I did clockwise is this wrong?
Chip should I loctite it next time?
I am going to replace the tensioner nut and stud for a new 1 this time
3 people checked it as I wanted to be sure on it all you know the rest of the build was fine its wierd how this has came loose
1 question tho which way should the tensioner be turned anticlockwise or clockwise?
I did clockwise is this wrong?
Chip should I loctite it next time?
09-08-2011, 08:10 AM
#38
Worth using the proper nut, even though they're a few quid each IIRC.
Also worth changing the bolts in the cam, I have had an old one of those work loose on me despite definately being torqued up correctly only a few miles before, luckily I spotted it before it came right off or that would have been equally nasty.
Also worth changing the bolts in the cam, I have had an old one of those work loose on me despite definately being torqued up correctly only a few miles before, luckily I spotted it before it came right off or that would have been equally nasty.
