Pinto Problem

[jaimo]

Well stu and i took head off today and discovered this

The problem has been number 3 fouling plug and burning oil point of misfire

Suspecting cvh valve stem oil seals but got to check guides

And orther ideas

[Guest mower man]

You certainly need to look at valve guides , have them bored out and bronze ones fitted with proper seals [ all of them !!] mick . do it properly and you only do it once

[jaimo]

When i took no 3 valve stem seals off there was oil all below alot lot more than rest so dont u think cud just be valve stem seals the guides were apparantly checked when skimmed is there any why to check them

[maccavvy]

I have a spare head if you want mate.

[jaimo]

Cheers marcus might be calling on you but how much play is too much on valve guides cause theres no play with valves in guides

[maccavvy]

I can't help that side dude..

[Bob Tucker]

It seems odd that no. 3 valves are so coked up, but the piston crown looks cleaner than the other 3?

Or is that just the photo?

[jaimo]

No bob u are correct i was abit taken back by that dont quite understand that unless the oil on plug is causing the fuel not to ignite fully so keeping piston clean prop not but what else would explain it

[alantoon]

http://i41.photobucket.com/albums/e262/Alan_Dawson/head_zpsk1jjilbz.jpg[/iM

 

It might be nothing but could that be a crack running away from the inlet valve?

Edited January 30, 2017 by Alantoon

[jaimo]

That link didnt work alan

But doent believe it is just ridge in carbon where we put screwdriver under while compressing spring to stop vavle droping

[Guest mower man]

When i took no 3 valve stem seals off there was oil all below alot lot more than rest so dont u think cud just be valve stem seals the guides were apparantly checked when skimmed is there any why to check them

Just replace them! they are not expensive if you have any apreciable play in the guides it will FUBAR the seals! .I might have some left will look them out , a clean piston like no3 COULD be h/gasket weep , are valve stems showing any wear ? really a full head recon is signalled as before do it right and you only do it once mick

[jaimo]

Had head pressure tested valve reground skimmed new cam bearing etc only guides not done as they said they fine and dont need doing so really apart from guides is a recon head

No sign of head gasket failure

Could be unburnt fuel in there as smells

of petrol and oil in engine and exhaust

Might ring headmaster ask how much for guides might even get new valves but no wear on them eiter

[Grim]

is there a valve impression in the head of the piston?

 

it does look like a crack in the head

Edited January 30, 2017 by Grim

[jaimo]

I will clean when home and post new pics

Cheers guys so far

Edited January 30, 2017 by jaimo

[jaimo]

Ok not took pics yet but definatly

No cracks anywhere

No marks on piston

No scoring on piston bores

Slight and i mean slight movement side to side valves in guides