Tap & Bolt Size

[old son]

Can somebody remind me what size tap and what size Allen bolts I need to remove the AIS from above the exhaust pipes at the front of the engine.

Thanks

[Cellarman]

M8 tap & socket-cap bolts use a non tapered tap with plenty of lube
Follow Pat's guide here & you wont go wrong

[old son]

M8 tap & socket-cap bolts use a non tapered tap with plenty of lube
Follow Pat's guide here & you wont go wrong

Thanks. How long do the bolts need to be?

[Falcon 269]

Sorry to contradict but I strongly recommend an HSS tapered tap to cut the thread in the stubs.  You need to cut the thread to about 1cm depth only, so a tapered tap will give you all you need and more with much less chance of snagging while you're cutting the thread.

[old son]

Thanks Mike

[Cellarman]

Sorry about that I meant to say tapered (brain fade)
I used 8mm stainless ones from Ebay cost a couple of quid

[Falcon 269]

Brain fade?  Yup, get that all the time

[old son]

Ive just bought five from eBay for 99p!!! Prices must becoming down ha ha

[old son]

Do I need an M8 x 1.0, 1.25 or 1.5 tap?

[mickvp]

Iirc 1.25 is standard M8 pitch, but it doesn't matter really as long as you get the right pitch bolts to match

[old son]

Thanks.

[RMT1983]

ive got a set from Ivan that I wont be using............................ pm me if your interested mate

[old son]

I've ordered the bolts and tap from eBay now. Sorry

[mick chiz]

id try running a 6.8mm drill down 1st.its the right size for tapping m8x1.25 holes