palmer3914

Hi there, have a few questions regarding Cosworth head gaskets.

I have a Group A gasket, and after 1000 miles running in and then 1800 miles @ 20/22psi (340-350bhp) its blown!!!!!!!!!!!!

Now im running a 205 block / 3 door head, it drips water from the head/block join drivers side back of engine!!!! and you can see it drip!!!

why would this happen in such a short time...... would this be down to the gasket or instalation of the gasket??????

whats a safe BHP for a group A??

and what gasket would you guys recomend to replace it with?

thanks

GARETH T

its easy to blame the gasket,,, maybe something wasnt flat when fitted ?

palmer3914

hhhmmm thats my thought as well, but head was freshly machined as was block decked..... so not sure,

Mike Rainbird

iTrader: (3)

Matt,
The YB611 gaskets are PROVEN, so it can ONLY be down to the installation to let go at this mileage.

palmer3914

Thanks mike just want to be sure before i go shouting @ people.

GARETH T

maybe the gasket was damaged when being fitted?

was it done by a garage?

Ham Sandwich

Hello,unfortunately the YB 205 engine has a weak spot exactly where its leaking from on yours!Is the water going into the oil?If it is just coming out the side of the block at the end in a minor way,i dont see a problem with continued use.

Anonymous

YB611's are shite - seen several blow at that power.

palmer3914

No oil with water mix!!!!! but continued use cant be good plus in 30miles it emptys a pace header tank!!!!!!! so id be filling up every 30 mins!!!!!!!

yes mate was done by a garage that built my engine .... engine is only 2800 miles old!!!!

Mike Rainbird

iTrader: (3)

Apart from the "minor" inconvenience of it loosing it's entire water contents every 28 miles .

And the problem had nothing to do with the 205 block, it was the headbolts and these were redesigned back in the late 80s (where many 3 drs had the gaskets / bolts replaced under warranty).

RichardPON

I've had no problems with a Group A gasket fitted nearly 5 years ago.

Like Gareth says, it may have been slightly damaged when being fitted.

palmer3914

yes thats what the guy told me, about these getting replaced under warranty, i mean i know it aint them as i have the ARP stud kit holding it together.

So it looks like down to fitting .... or maybe the head/block wasn't flat, either way its fooked!!!!!!!!!

So ............... do i go for another GROUP A item something else???? bareing in mind i dont have buckets of money to chuck at it!!!!

GARETH T

palmer3914, buy a late esccos gasket,, cost under a 10 quid,, and better than the group a

Ham Sandwich

Mike Rainbird,they are prone to blowing at that point due to the not so good water flow of the 205 engine compared to the 200 series.The problem my dear friend is heat from the turbo/manifold/exhaust and a not so good made gasket,of course not ALL blow prematurely,but when they do its normally at that area.palmer3914 may i suggest you use the cometic multi layer gasket at around Ł120 this will cure the problem,but do make sure you check head/block for flatness.

Smit

iTrader: (5)

Matt - My YB611 which Harvey installed when he did my engine has been fine for 18k

palmer3914

Yeah i know!!!! like you smit im playing it by ear at the moment!!!! waiting to see what the (garage) say.

Dont mind paying for the gasket but Il be fooked if il pay any labour!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!

Mike Rainbird

iTrader: (3)

You may have found the problem . ARP bolts and 205 blocks go together like paedophiles and primary schools . You should have used standard bolts, as the ARPs crack 205 blocks around the stud holes and this is probably why coolant is pissing out everywhere .

Ham,
The constant heating / cooling process in that area caused the original studs to stretch more than they should have, so most of these have long since been replaced under warranty and the old studs haven't been in circulation for a number of years now, having been superceeded to cure the problem .

palmer3914

ok, what should they be tightened to........... torque wise ideally that is!!!

Karting

Mike, I might be wrong, but if the threads are not clean of oil, will it not hydraulic? My thery??????????????????

Ham Sandwich

Mike Rainbird you beleive what you like.

Ginge !

where are the late escos headgaskets for 10 quid

SteveB

iTrader: (3)

Woodford at shows

Ginge !

i gotta go to a show to get a headgasket , what if the cars broken down

anyone else know somwhere


cheers for the help steve, when i start me rebuild i hope ya will be just as helpfull

got some of the parts today infact

Disabled Account

Ginge, get one from your local Ford dealer YB1161 in the number stamped on the late Es Cossie gasket.......Also available from Woodford/PJ motorsport mail order

Ginge !

cheers doug ill try it

gonna try and rebuild the cossie as im bored and aint got a job

if i fook it up i can break the car as most of it will be in bits anyway