XXO/BVGC '38 Chevy Coupe Build

[pops29]

   
warning _____ these images can be disturbing !!!!!!


Buddy was upset we could not make an attempt to backup our 186 MPH run but the flatcad gods were looking down on us that morning ..... this is what I found


This is the timing gears or what is left of it !






If we did go out for the backup run it would have let go !!!!

[RichFox]

Good find. When i was plasma coating aluminum with ceramic, we used steel grit that was very coarse and sharp. Gave the ceramic a good bite. And went straight from the blaster to the spray booth before the aluminum could begin to oxidize. Those were bigger engines with fewer pistons.

[Peter Jack]

Pops29, for some reason your images don't show up on the computer. I can imagine what you're showing but I'd sure like to see the pictures. Sometimes my imagination's a little distorted. 

Pete

[pops29]

not sure why u cant see them ?  you can try here  --   http://www.jalopyjournal.com/forum/showthread.php?t=728009&page=36

[38flattie]

Don, the pics now show up for me.

Well, it's apparent we weren't going to be successful on the backup run, even if we had not had the port issue!

Don reports the dizzy housing is scored, so it's apparent we lost at least part of the gear pin from either the dizzy or mag.

[GH]

Buddy, I visited with John K and Randy J at Mo-Kan today. Randy has a bad case of SALT FEVER.

[38flattie]

Buddy, I visited with John K and Randy J at Mo-Kan today. Randy has a bad case of SALT FEVER.

Haha! It's great, isn't it?

[DND]

Hi Pops

I used Summers Bros gear drives on my customer engines and they were a great product

During the set up on a new unit the backlash was set, and the crank was turned to look at something else and for grins I checked the gear lash and no Clink - Clink

Back to top center and it was fine, turns out the cam gear was out of round

So Bob sent me a few more gears to check and they were bad, had distorted in heatreating and they had made 100 pcs [ they were not happy campers ]

Maybe one of your gears might have been that way too, and loaded the bearing in the tight spot

After that I always checked for the Clink= Clink in several spots of crank rotation to be on the safe side

G Don

[38flattie]

Don, thanks for the info! I have confidence in this Donovan gear drive, and will be sending it back to them to rebuild.

I don't think the problem was in the unit. I simply don't think you can run metal roll pins through them and expect them to survive!

[pops29]

 Ok The mystery is solved !!! I tore the front timing cover off and I found more crushed up steel



So as I was looking around at the parts I removed and



I found where the pin came from



this is an anti-rotation pin for the idler gear shaft.. What we think is we started to lose the bearing and the shaft rotated and sheared the pin. We will now look in to the oiling system to the front of the cover

[charlie101]

Is it just me or is there no pictures since Reply #2051? I tried both IE and Mozilla! The last pic I can see on HAMB is also the same as on this forum, the cylinders in Reply #2051!

[Stan Back]

It's just you.

[Sumner]

Is it just me or is there no pictures since Reply #2051? I tried both IE and Mozilla! The last pic I can see on HAMB is also the same as on this forum, the cylinders in Reply #2051!

Same for me  ,

Sum

[Peter Jack]

I'm still having the same issue on both my mac and a pc.

Pete

[38flattie]

It's hit and miss for me-one time they're there, then they're not, then they are!

Looking at the damage, it appears we need to add a couple of oil sprayers to the gear drive. I think the dry sump worked too good in this case, and we probably 'starved' the gear drive for oil.

I'll send the gear drive back to Donovan, and see what they think, and let them repair it.