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 timing gears, metal or hybrid?

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T O P I C    R E V I E W
green96v4Posted - 12 Apr 2021 : 13:18:56
so at a bit of a cross roads with my car, I've never been fully confident with the fibre timing gears (I know there's a lot of people who say they're fine and should never give you any problems, but...)



a Ford engine specialist in Essex is telling me the metal gears are way too noisy and I'll regret fitting them (image borrowed from MotoMobil) and are recommending the "hybrid" gear design as the material is much harder than the original fibre (which they've also point out is now 50 years old)




A far away dream is the possibility of fitting a/c, summers in Ontario are pretty toasty (often in the +30C range) there was a dealer fit a/c in North America and they occasionally come up for sale, or figuring out a Vintage Air set up might be a cool winter project

So question for anyone with a full metal gear set - are they noisy? would the hybrid set be up to the load that a/c would put on it - prices are about the same, so it's more about the balance between refinement and longevity
15   L A T E S T    R E P L I E S    (Newest First)
green96v4Posted - 15 May 2021 : 13:19:12
bought it off Paul Green (post thread on this forum somewhere) he posted it to my parents in Oxford and I brought it back in my hand luggage a couple of years ago - that was fun getting through airport security!!
DerekPosted - 14 May 2021 : 11:39:26
I notice that you have managed to find a 34ICH with the fuel feed spigot in the correct one of the 3 possible positions. A good find.
mellePosted - 12 May 2021 : 21:49:50
That's not OCD, just good engineering practice.

www.saabv4.com
green96v4Posted - 12 May 2021 : 21:43:15
thanks - I've even gone a little OCD and ordered ABA clamps for all the hoses, I'll add more images as I progress, it's almost like a restoration 2.0 on the engine bay!
DynorogPosted - 12 May 2021 : 20:50:00
Looks damn good to me Matt
Cheers

Dynorog
green96v4Posted - 11 May 2021 : 16:07:56
thanks - yes I think the official order is how you've stated, possibly where I went wrong (cam shaft gear wouldn't budge until the others were off, but by then the damage had been done)

you want to see the gearbox (currently in South Carolina and the guy rebuilding it is making my work on the engine look shabby!!)
mellePosted - 11 May 2021 : 14:12:31
I always remove the balance shaft and cam gears first, not sure if there's an "official" order, but this works for me. Looking shiny by the way Matt!

www.saabv4.com
green96v4Posted - 11 May 2021 : 13:38:40
yes I had the puller on the crank gear and one of the fingers touched the cam gear which caused the damage (and as you said cam gear just came off with 2 tyre levers gently behind them)
mellePosted - 11 May 2021 : 13:25:13
The cam gear usually needs a little persuasion with a tyre lever, but I never use a puller on the cam and balance shaft gears, they should slide right off. The crank gear you can't remove without a puller.

www.saabv4.com
green96v4Posted - 11 May 2021 : 12:20:47
update on this, (and for anyone in two minds about the strength of the original gears) Ian at Specialised Engines wasn't a fan of the original fibre gears and recommended the newer "hybrid" gears, even though they have fibre teeth, they are much stronger than the originals (and 50 years younger)

after hearing from a couple of different sources that these will also be up to the task of taking the extra load of a rotary piston a/c compressor (if I ever get to doing that job) as well as peace-of-mind they shouldn't be a failure waiting to happen, I bit the bullet and ordered a set.

Taking the original gears off confirmed my doubts about the strength of the fibre - the gear puller changed angles as I was tightening and touched the large gear...and crunch, now useless (superglue maybe?)



looks like there was also some tooth damage from before (previous rebuild?)






New gears look cool too, shame they get covered up

DerekPosted - 17 Apr 2021 : 12:26:39
Thanks Woody. I thought I was Guru before but can't go back to check now. lol. I don't know what the post number/status grades are, not that it matters of course. It might just be 1000 looking at the members list.
WoodyPosted - 16 Apr 2021 : 20:49:47
Welcome to Guru status Derek :-)
DerekPosted - 16 Apr 2021 : 12:00:58
Thanks for replying to my milestone 2000 post.#128526;
green96v4Posted - 14 Apr 2021 : 17:37:06
thanks Derek - that's exactly what I wanted to hear and ties in nicely with another opinion I've heard on this subject
DerekPosted - 14 Apr 2021 : 16:42:46
The dealer fit steel gears fitted along with the AC was for safety with the piston type York compressor. If fitting AC now you would almost certainly use a rotary compressor which is much kinder on the gears. Fitting with old fibre gears likely risky but new fibre ones should be fine. IMO.

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