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T3 Sport / Touring Forum For the discerning Hinckley Sporting Enthusiasts. Open to all lovers of the original T3 Sport Models including the Trident, Sprint, Sprint Exec, Daytona, Trophy, and Speed Triple.

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Old 11-28-2012, 05:24 PM   #1 (permalink)
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Cylinder Head Installation - Torque Angle

Recently saw some leaking coolant after changing out the cylinder head gasket on my D900 (had to replace the lower cam chain guide). Not a lot of coolant, but enought for me to want to change out the gasket again.

I've done this work before and never had a leak, and I'm wondering if maybe I didn't quite get the final torque sequence right. I'm especially concerned with the final 90 torque angle on the head bolts, since there is really not enough space under the frame to get a torque angle gauge on every one of the bolts.

Anyone have any advice about getting that torque angle correct, or any opinions about how critical it might be?

Thanks,
Sean
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Old 11-28-2012, 06:36 PM   #2 (permalink)
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Triumph did have a bad batch of gaskets recently, so i hear.
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Old 11-28-2012, 08:56 PM   #3 (permalink)
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I never used a torque angle gauge on mine; 90 is a quarter turn and I can do that pretty precisely without one. I just started with the ratchet parallel to the front of the case and ended with it perpendicular, IIRC.

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-Kit
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Old 11-29-2012, 09:59 AM   #4 (permalink)
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T552 - do you remember where you heard that from? I'd like to do a little searching on that one, if for no other reason than to make me feel a little better. Like I said, I've taken cylinder heads off before and never had one leak. I'd like a confidence boost!

The gasket I got did seem pretty cheaply made, compared to the one that came off the bike. Mostly fiber, with just some inset copper rings at the cylinders. The previous one was a laminate of some sort.

Thanks, Kit. I pretty much did the same thing, so I guess I couldn't have been too far off. I'm going to get a new gasket, pull the head and be extra careful about putting it back on.

Thanks to both of you!
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Old 11-29-2012, 10:38 AM   #5 (permalink)
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Good luck, let us know how it goes. Gaskets ought to be made of some sort of titanium/gold alloy for what Triumph wants for them. I am not looking forward to the months of ramen noodles I'll be eating when I do this to my T625; I'll be screaming bloody murder for sure if I get a bad gasket!

Cheers,
-Kit
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Old 11-29-2012, 02:08 PM   #6 (permalink)
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I think it came from David Clarke, author of the recent t3 book.
He refreshed a speed 3 motor and had a problem with a leak. It came from Peacocks in the UK

Last edited by t552; 11-29-2012 at 02:10 PM.
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Old 12-10-2012, 04:08 PM   #7 (permalink)
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The first gasket I did my head with looked like it was made from recycled cardboard. It failed.

The one I have now looks more substantial and has a bead of factory applied sealant around its perimeter.

To control the 90 degree turn: clean the bolt ends and use tippex to mark the bolt head then just turn that bolt 90 from a point on the head you visually align the tippex mark with - a degree or two either way shouldn't matter.
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