hello people... can anyone tell me wot causes the oil cap to blow off??? its just started doin this and only does it when i drive it hard. i think it might be smokin more than usual or maybe im just bein paranoid.

 

too much pressure in the crankcase, its really really bad, my old xr3i did that and then 12 miles later the entire bottom end threw in the towel

 

Blow by on the piston rings. Go the same on my FRST which is why I'm doing a rebuild over the Winter.

Try a new oil cap and cleaning all the breathers out as a first port of call

 

that dosnt sound very good everytime i fix something another thing goes wrong. wot does a bottom end rebuild consist of??? good time to uprate a few parts then

 

Dunno as I've never done a standard one The one in my Escort was about the Ł2400 mark. I'm expecting the whole build on the FRST to be about the Ł2k area

 

Check your breather system before worrying about a bottom end re-build.

 

Yeah, i had problem oif Mayo, trying to blow cap off (screw in type) and dip stick out on my 1800 CVH sierra! It was cause i had a Piper-x filter fitted and numpty at garage hadn't done anything to sort out breathing!

I was shatting at first, thought rings had gone! Fixed it, did another 20k and still going strong (until some tit hit me)

D

 

what?!?!

 

im not very mechanical wot do u mean by sort the breather system out??? it must be workin cause theres oil where the end of the pipe sits. not a lot... that is normal i hope.

 

as scotish greg says clean all the breather pipes out and replace if needed they usualled cause excess crankcase pressure.check these first before thinking about a rebuild. good luck m8 hope it works its definately the cheaper option!

 

buy a haynes manual

clean the breather pipes as said (all the black pipes coming off the rocker)

i doubt its that tho the cvh does tend to get tired and worn around the 90 - 100k mark

 

cheers for the advice guys i dont think its the breather system. like i said before it seemed to be startin to smoke a bit aswell and its gettin worse.

 

they can smoke when breathers filled with gunk too mate, so go clean it out!!

 

The breather filter is still available from Ford and costs about Ł12 iirc

 

i had the oil cap blow off myne so i got a new one and then the dip stick keeps blowing out by a good 2 inch so i now have a replacement engine which will be put in asap and i can rebuild the engine thats currently in there to a nice reliable spec

 

Welcome to the world of ford... this week ive bought a bernie gearbox, kent cam and a new ap clutch, all because my gearbox decided to shit itself the other night.

 

common problem at higher revs - couple of zip ties to hold cap on and then fit a decent Bailey type breather system with catch tank etc - breathe to atmosphere don't try to recirculate the air

 

Zippying on the oil cap isn't curing the problem. It's a bodge. If changing the breather system doesn't cure the problem it is suffering with blow by on the rings. Only way to sort this is to change them