Jerry Woods Chain Tensioner Mod

[Porsche_monkey]

In his book Wayne says 'an emergency retaining collar' mod is available at 101projects.com.

Anyone know where on the sight it might be found. I had a look and can't find it in the tech articles.

[cstreit]

PBH.

It's an extraordinarily simple device. Two aluminum collar halvs that clamp on to the tensioner shaft to prevent it from collapsing all the way. Highly recommended.

http://www.pelicanparts.com/cgi-bin/dbsql/db.cgi?db=partsearch&mh=20&view_records=yes&uid=default&description=tensioner+collar

The collar is the device on the lower left.

[Rot 911]

I used to run them on my 72E. Inexpensive insurance!

[Porsche_monkey]

Is that the right part for hydraulic tensioners?

[Tim Walsh]

The Pressure fed tensioners don't need them. And I don't belive they fit anyway.

[Porsche_monkey]

Waynes book, page 170, clearly says there is a retro-fit for hydraulic tensioners even though they almost never fail.

Maybe he has never posted it?

[john walker's workshop]

i've never seen one. the early tensioners, like the one pictured are hydraulic, but reservoir style, not oil fed.

[Porsche_monkey]

I guess only Wayne knows what he was referring to...

Wayne are you still in Hawaii?

[ischmitz]

If you look at the PP site it says: Not for pressure-fed tensioners

[Doug Steinel]

I asked Wayne a few months ago about using the collars on the Carrera tensioners... he said they wouldn't fit but he is working on a technical paper on this. Expecting it sometime soon. PBH, I have a pair of these collars if you want them. I decided to go to the Carrrera update so I didn't use them.

[ischmitz]

I could use a set. What do you want fot them Doug. I have a 2.0S motor that is going into the track-914

Cheers,
Ingo

[Doug Steinel]

ischmitz,

If you want them, you can have them for half the price our host charges... $15. PM me your address and I will mail them to you. I have everything they come with: instructions, the 2 collars, a gauge to space them properly and an allan wrench to tighten them up. When you get them, just mail me the $15.

[Bill Verburg]

I used them on my '72 w/ the old style, sealed, tensioners. They saved the engine.

[markwemple]

I am one of the members who prefers the old tensioners, but, then again, I look at all the tensioners are repair/replcement items. Like a timing chain, they have a lifespan so I would rather have the benefit of the collars. I can tell you, from practical experience, they will give you enough notice, when the tensioner has failed, so that you will know its time to pop the back covers.

[Wayne 962]

Hi there. You guys are all on the wrong track. There indeed is a mod that Jerry Woods showed us duirng his engine rebuild class. It involves taking apart the Carrera chain tensioner and placing a small stop-piece on the bottom. This limits the overall travel of the tensioner and makes it virtually impossible for it to skip a tooth.

I started to do this write-up, but I never completed it. Maybe in the near future - it's quite interesting.

-Wayne

[aigel]

Basically, instead of adding a shim on the outside of the shaft you now limit the shaft travel inside, in the bottom of the tensioner by disassembling the tensioner and inserting a shim. You need to measure first, to determine the thickness needed. Woods does this on all his rebuilds using carrera tensioners. The last straw to make them truly bullet proof. I think you can use 5/8" brass tubing to fab the shim. The only disadvante is that you won't be able to use the grenade pin because the tensioner will not collapse completely any more.

I am about to upgrade mine and do the mod. I will take pictures and post.

George

[Porsche_monkey]

I am not sure how you assemble this if the shim is in place, since you can't compress it anymore.

[aigel]

Of course you can still compress it and install it. The travel is however limited so the tensioner can't collapse. Only in it's fully retracted state (collapsed) is when you can insert the grenade pin. You will have to install the modified tensioners like you do the old ones, with a C shaped tool holding it together.

George

[Porsche_monkey]

Oh......I see.

[Jubbie]

George or Wayne,

Did you ever get around to document this mod to the Carrera tensioners. I would be interested since I am there now on the rebuild.

Thanks