Stripped valve cover threads *facedesk*

[staticvoid]

On the screw hole just above the intake valves on cyl #1. It was the last screw we put in, turned it, and it kept turning and turning.


This is on the '99 Kat 750 I'm rebuilding.

The screw hole was in a camshaft bearing retainer cover, on the top. So I really don't want to take it out if I don't have to.

It looks like the best way to repair it is using a Helicoil repair kit. It's my first time doing this sort of thing, so I'd like to hear about what the general experience is like, and whether Helicoil is even the way to go.

Many thanks

[loudnlow7484]

I'd imagine a helicoil would work fine......... they don't need to take a lot of torque. But really, take the cam cap off and work on it away from the motor. Nobody likes metal shavings in their oil!

[arsenic]

it's a M7 x 1.00 helicoil. You use a 9/32" drill bit it's not hard. However if you try to do it without taking the cap off, that's hard.

[Tmod]

Make sure if you use a heli-coil or perma-coil that you break that tab off at the bottom and remove it before putting it back together.

Tmod

[arsenic]

yeah, that very clear in the instructions, they mean that. And ya, I have perma-coil set, I couldn't find a heli-coil kit.

[staticvoid]

Perma-coil, I will look for that. M7x1.00, that saves me a bunch of time! And I'll be sure to take the piece off before drilling it out. Thanks very much all!

[arsenic]

you don't take that piece off before you drill it out. Do you have any idea how those work? You install the heli-coil (using the tang) and then break the tang off when it's in. I have the cam cap you need BTW, just tell me the letter and the shape on it, $25 total and you'll have it.

[Tmod]

you don't take that piece off before you drill it out. Do you have any idea how those work? You install the heli-coil (using the tang) and then break the tang off when it's in. I have the cam cap you need BTW, just tell me the letter and the shape on it, $25 total and you'll have it.

I think he means the cam cap.

Tmod

[arsenic]

ok, that makes sense Yeah, take that off

[staticvoid]

you don't take that piece off before you drill it out. Do you have any idea how those work? You install the heli-coil (using the tang) and then break the tang off when it's in.

Right, I meant take the cam cap off before drilling out the hole. It looked like that little tang on the coil may need to stay on for the installation, since the tool that screws in the coil appears smaller than the actual coil. Dunno yet, I haven't read the instructions

Incidentally, the procedure to remove the cam caps also has me resetting the cam chain tensioner, which doesn't look too bad. I'll need to unscrew all of the cam caps a little at a time to avoid breaking the camshaft too.

I feel a bit like I'm being sucked down the rabbit hole into Wonderland. Not that I mind adventuring inside a 750cc four cylinder, it's just a little more work than I thought.

Thank you again

[ATOMonkey]

If you want to go completely overboard, you can also repair threads this one of these guys.



Key lock inserts. Very nice...

[Tmod]

Or my favorite.

[YOUTUBE]http://www.youtube.com/watch?v=qFSyfY1VLtU&eurl=http://www.timesert.com/html/install.html[/YOUTUBE]

Tmod

[ATOMonkey]

no youtube at work...