cam cap bolthole issues..

had all 16 cam cap boltholes timeserted...well..they didnt take...not sure if ir was shoddy machine work or not..im at my wits end...wondering if anyone has had any experience with loctite thread former????or any other ideas...head has been totally rebuilt so im trying not to give up on it just yet...thanx for any replies...

brianrae33 wrote: had all 16 cam cap boltholes timeserted...well..they didnt take...not sure if ir was shoddy machine work or not..im at my wits end...wondering if anyone has had any experience with loctite thread former????or any other ideas...head has been totally rebuilt so im trying not to give up on it just yet...thanx for any replies...

None of 'em took?

Wonder if any of the other totally rebuilt work took? :ohmy:

Good Fortune!

Patton wrote:

brianrae33 wrote: had all 16 cam cap boltholes timeserted...well..they didnt take...not sure if ir was shoddy machine work or not..im at my wits end...wondering if anyone has had any experience with loctite thread former????or any other ideas...head has been totally rebuilt so im trying not to give up on it just yet...thanx for any replies...

None of 'em took?

Wonder if any of the other totally rebuilt work took? :ohmy:

Good Fortune!

I was wondering the same thing! I don't understand a timesert "not taking" unless the guy used the wrong drill bit or tap when prepping the hole for the insert. Here's how uncomplicated they are to install:

loctite threadformer is a waste of time........... :S not strong enough for the stress that it will get on retaining cams.....I used it once and that was enough :blink:

Brian, 50% of the cam cap bolts are dowelled, this means a much more accurate approach has to be taken.
You may have to seek advice from an expert w.r.t. the methodology and principle of the Timesert.
In an emergency, they do make a 3/8" threaded insert, with a "loctite" strip, with a 6mm internal thread. They also make a "Bigsert". Have a look at the space you have to utilise either.

Before attempting to go bigger, I would see if you can save any of the ones that "didn't take". Remembering you can go deeper for the bolt holes with dowels.
RegardZ.

All of my Timesert kits have the correct drill bit inside the kit box.

Like Garn just said, the cam cap bolts with the dowel pin are a lot harder to do properly.

I have not inserted a cam cap bolt thread with the dowel pin in 12 years, but I kinda remember removing the top lip from the insert because you can't get the Timesert cutter down in the recessed dowel pin hole.

Are you talking about a Helicoil ?
If so I had a cam cap that was helicoiled for the correct 6mm bolt that pulled out.
I was told to try a 1/4-28 american threaded helicoil in its place.
Then use the proper length 1/4-28 bolt.
This worked for me.
Good luck,
Mark

1/4-28 will work...... :blink:

MTH76 wrote: If so I had a cam cap that was helicoiled for the correct 6mm bolt that pulled out.
I was told to try a 1/4-28 american threaded helicoil in its place.

The rule of thumb is Fine thread 1/4 28 into Steel, and Coarse thread 1/4 20 into Aluminum. There's a ton of info on the internet on the subject, have a look.

Click - - - -> Timeserts



.

I have done dozens of helicoils and timeserts over the years and not one has failed. That includes all the cam cap holes on both my bikes GPz1100 and KZ650. When done properly they are better than the original threads. If yours all came out then they were installed improperly, period. I would be leary of any of hte the other work this shop has done on your engine. And no the loctite thread repair will not work for the cam caps.

In this installation one just skips counterboring the hole. The Time-Sert will clear the dowel hole while the counerboring tool won,t. There is still plenty of vertical clearance for the dowel.
art

That's really good to know....thanks