75 Spectra V-Drive

WESTERNAERO · 12-18-2013, 07:59 AM

I wouldn't be worried about the collar. The diameter of the collar isn't large enough to have any rotating mass that would cause vibrations or anything to loosen the bolts if torqued properly and locktite is used. There's no end thrust applied to move the collar forward so that's not an issue either. If your really worried about it coming apart, assemble it, tighten the collar in place and then remove the drive and tack the two pieces of the collar together. I'm not a fan of doing something like that but it would give you the peace of mind you looking for.

WESTERNAERO · 12-18-2013, 09:40 AM

Do you really need the collar? You're going to shorten the splined end of the shaft, why shorten per the instructions? The PTO coupler is splined thru, so why not machine the that end so it has 1/8 - 3/16 off the end of the crank? If you chunk it up in a lathe so the face is square to the splines then there is no need for the collar. The collar is there so the shaft doesn't move too far forward and comes out of the trans. If you set the end-play to the crank, the collar is useless.

**78Southwind** · 12-18-2013, 12:02 PM

Originally Posted by WESTERNAERO

Look at the end of the cam, if it's crane it should say crane. The 13 indicates that it's for BBC, 945 will be the type of cam/grind it is. The copper paint or die between the lobes also looks like a crane. Call crane they'll tell you exactly what it is. With a number like that it's not a custom grind it's a catalog piece.

I spoke with a Crane Cams Tech and they said they made it but didn't finish the Cam. So it is a custom grind. Basically they sold the cam to another company and that company finished it so Crane doesn't have the specs to it. The Crane Tech said the number 139456 means BBC solid roller.

**78Southwind** · 12-18-2013, 12:30 PM

Originally Posted by WESTERNAERO

Maybe that's why it has a "6" at the end of the P/N. I wonder who finished it?

I thought it was Chris Straub's cam but he said no.

**78Southwind** · 12-18-2013, 01:52 PM

Originally Posted by WESTERNAERO

Do you really need the collar? You're going to shorten the splined end of the shaft, why shorten per the instructions? The PTO coupler is splined thru, so why not machine the that end so it has 1/8 - 3/16 off the end of the crank? If you chunk it up in a lathe so the face is square to the splines then there is no need for the collar. The collar is there so the shaft doesn't move too far forward and comes out of the trans. If you set the end-play to the crank, the collar is useless.

Originally Posted by WESTERNAERO

I wouldn't be worried about the collar. The diameter of the collar isn't large enough to have any rotating mass that would cause vibrations or anything to loosen the bolts if torqued properly and locktite is used. There's no end thrust applied to move the collar forward so that's not an issue either. If your really worried about it coming apart, assemble it, tighten the collar in place and then remove the drive and tack the two pieces of the collar together. I'm not a fan of doing something like that but it would give you the peace of mind you looking for.

Thanks...I will think this through.

WESTERNAERO · 12-18-2013, 02:13 PM

Originally Posted by 78Southwind

Thanks...I will think this through.

I think the TCI's idea with the collar is if some guy is doing this in his garage and the only thing he has is a chop saw to cut the shaft to length. The cut won't be square, but by putting that split collar on there it will provide a perpendicular shoulder for the end play. The PTO becomes part of the crank when it's bolted on. So what's the difference if the end play is set from the PTO face or inside the PTO on the crank. Hope I'm making sense here.

**78Southwind** · 12-18-2013, 02:39 PM

Originally Posted by WESTERNAERO

I think the TCI's idea with the collar is if some guy is doing this in his garage and the only thing he has is a chop saw to cut the shaft to length. The cut won't be square, but by putting that split collar on there it will provide a perpendicular shoulder for the end play. The PTO becomes part of the crank when it's bolted on. So what's the difference if the end play is set from the PTO face or inside the PTO on the crank. Hope I'm making sense here.

I get what you're saying...