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

 

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

 

Oh dear how much ŁŁŁ am I looking at

 

just had this happen to me gutted for you pal

 

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

 

Shit oh well back to the f***ing drawing board then

It was a new engine aswell

 

How much are the valves any 1 know

 

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 have timed it back up it and it sounds like it has compression

 

I had this on mine yrs ago, got away with it though, time it up and see if it runs is all you can do m8.

Steve

 

Cheers mate if it has done all the valves how much am I looking at as the missus is starting to put her foot down as this engine has just cost Ł1600

I might have no choice but to flog my 500 bumper and get it done out of that

 

What kind off timing belts is this???

 

The normal 1 but it was the tensioner nut that came loose

 

Any 1 know if the bottom end will be fine

It was brand new only ran for 20 mins

 

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

 

Good on the bottom but do you think the head will be goosed then mate thats was new aswell only ever had 1 small skim and just been rebuilt

 

Whoa oh dear

 

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!

 

from graham goode about 14 pound each from burton power sodium filled about 45 pound each

 

Hope you've more luck then me mate, honestly

 

Nice 1 guys it has been retimed and it turns over freeish I suppose Oh well if it needs new valves then it will have them

 

This happened to my mate apart from he was flying on the motorway when the nut came loose and bent all 16 valves and put tiny little cracks in the pistons.
Another rebuild needed with plenty of thread lock on the tensioner nut.

 

mine did the same thing about a year and a half ago, it bent 8 exhaust valves and 2 inlet valves

 

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!

 

so what could be done to prevent this ? another type of nut? or just threadlock ?

 

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

 

Same thing happened to mine 16 new valves and 4 pistons later.

 

Heart breaking decided to do a full rebuild

 

God knows how it came loose but it is just a normal nut on it

Any way 3 people did know what they were doing Chip and its only slightly done 5 valves thank god

 

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?

 

siscossie, that looks like it happened at fiarly high rpm!

nasty!

 

He might get 4 people to check it this time

Steve

 

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?

 

Not really no just pulled out the drive, them a bang and it all went silent. Well apart from me crying that is !!!!

 

Bloody hell mate what a mess.I would be bloody gutted.

 

I changed mine to a 4wd head after my incedent, had the machine shop put a new stud in for the tensioner and got the proper nut from ford. All was well after that.

 

Have u got the part number for the nut mate

 

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.

 

my belt stripped the teeth on my saph wrecked valves,guides and a cam

 

Chip what does the proper nut look like as on mine its just a normal 17mm nut and a flat washer