jumbomechanic

Hi guys,

I'm just about to remove the head bolts from my 1998 sti type R engine.

I've looked at the head of the bolts and they appear to be a "non standard" design.......??? It looks like the sides of the 12-point heads become shallower towards the bottom of the grooves??

It's difficult to describe - but basically a multi point socket fits on but grips less towards the bottom of the grooves because of the design??

I'm worried that I might "round" the bolt heads using a normal multi point socket?

So, does anyone know if there is a special tool/socket for these head bolts, or is this normal and I just use a standard multi point socket?

Thanks for the help!

pete marshall

iTrader: (1)

I removed mine with a 12 point socket without any problem

jumbomechanic

Ok, thanks Pete! I assume the bolt head design is the same for all makes etc?

I'll give it a go then!

ditchmyster

iTrader: (7)

T13 female socket, long reach, don't get a stubby one as it struggles to clear the cam lobes.

pete marshall

iTrader: (1)

T13? or E13?

merlin24

iTrader: (1)

1/2" drive 14mm 12 point socket.

Mick

jumbomechanic

Thanks guys......one head removed, and damage found.......

- 1 exhaust valve with hole in
- piston with damage/burr at outer circum approx 10mm in length

Both damage in same cylinder but not enough to cause engine failure, coolant loss and failure to start/run???

I wonder what lies in store under the other head??!!