Repairing a Loose Timing Gear Spindle in Case

elefantrider

elefantrider

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Recently I bought a bare set of late 650 engine cases with a timing cover and a crankshaft. When I say bare, I mean they were at some point stripped of all its hardware, cam & timing gear. The cover and cases were just held together by a few screws.

I removed the timing cover and the spindle came out attached to the cover intead of the case.

Has anyone had any luck with Loctite to hold a loose spindle in the case?

I remember Mick Hemmings recommended installing a bush, and the workshop manual recommends copper plating oversize.
 
Plating would be less expensive and adequate. A bush would be better but requires machine tools. I would not use Loctite.

Slick
 
On second thought, I don't think any glue is going to hold in there. The release method for JB weld or Loctite is heat.

So it looks like copper plate or a brass bush are the only options. Now to find a shop who can do copper. I know a shop who does Mil Spec cadmium to a thickness but not copper.
 
Is this the spindle that needs the special support plate when torquing the cam sprocket nut or tensioning the chain to avoid wallowing the casing hole?
 
elefantrider said:
Recently I bought a bare set of late 650 engine cases with a timing cover and a crankshaft. When I say bare, I mean they were at some point stripped of all its hardware, cam & timing gear. The cover and cases were just held together by a few screws.

I removed the timing cover and the spindle came out attached to the cover intead of the case.

Has anyone had any luck with Loctite to hold a loose spindle in the case?

I remember Mick Hemmings recommended installing a bush, and the workshop manual recommends copper plating oversize.
Click to expand...
I had one that was a little loose - came out easily but didn't rock noticeably. I cleaned it all and then put it in with Locktite 638, immediately put the cover on and waited overnight. It was definitely locked into place. 638 is good for 180C (355F).

If it rocks in the hole, then I think a bushing is required. However, getting the bushing slightly out of line will be a nightmare if you go that route.
 
kommando said:
Copper plating, first bath in plating shops, lowest priced chemicals so cheapest.
Click to expand...
Keep in mind that if you make the shaft bigger, you'll have to deal with the intermediate gear bushing. That is unless you just get the end plated.
 
A bush will require machining but IMHO is the better long term solution, especially if the bore is bell mouthed.
 
acadian said:
A bush will require machining but IMHO is the better long term solution, especially if the bore is bell mouthed.
Click to expand...
If I had the 650 stripped to that point I'd explore machining a needle roller bearing for this known issue of a wallowed out support area .
 
Torontonian said:
If I had the 650 stripped to that point I'd explore machining a needle roller bearing for this known issue of a wallowed out support area .
Click to expand...
A needle roller won't improve the strength.
The issue is not rotational, it is putting bending stress on an unsupported shaft. The same thing will happen to a needle roller if the shaft is not supported for tasks that tension the cam chain.
 
Gilesy said:
Loctite 638 will do the job. The only issue is if you want to get it out again.
Click to expand...
Yes might be worth doing this type of fix to save having to remove/dismantle engine for machine work. Is there any way to machine it in frame?

If it doesn't hold up, can still go the machining route at a later time.
 
O.P. Says it's a motor basket case situation , so I would put the timing side case into a machine shop and have them bore / cut out for a bush that lines up straight to the support of the timing outer cover .
 
Torontonian said:
O.P. Says it's a motor basket case situation , so I would put the timing side case into a machine shop and have them bore / cut out for a bush that lines up straight to the support of the timing outer cover .
Click to expand...

I am not a machinist, but it seems to me it will be a helluva task to line it up " straight to the support of the timing cover" without a dummy timing cover modified for the purpose.

Perhaps the machinist can pick up the spindle center and go from there.

I would go with copper plate, then turn down to spec. on a lathe.

Slick
 
The spindle came out with the cover, instead of being retained in the case. So instead of being an interference fit in the case, it is a sliding fit. Two sliding fits might be just fine, depending on clearances. And why is loctite retaining compound being ruled out. Within specs, this could be a perfect application.
www.henkel-adhesives.com

Retaining Compounds

Secure bearings, bushings, and cylindrical parts into housings or onto shafts
www.henkel-adhesives.com www.henkel-adhesives.com
 

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