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MG TD TF 1500 - Crankshaft pulley with scroll threads

The crankshaft pulley on my XPAG engine has scroll threads. Pictures I've seen of the installation of a lip seal on the crankshaft pulley show a smooth surface with no scroll threads. Is the pulley I have from an early engine? I can't see the lip seal being very effective when installed over scroll threads. Any advice or information would be appreciated.

Tim
TD12524
TW Burchfield

Speedy sleeve will cover the scroll

Bill Chasser
TD-4834
W. A. Chasser Jr

Tim,

I would imagine your "scroll threads" would would actually be wear marks caused by the rope seal. I've never seen a crankshaft pulley that wasn't smooth or simply worn.

Gene
Gene Gillam

Scroll threads (oil slinger) should be uniform and look like about what you would find on the TC pinion bearing end piece "seal" near where the diff connects to driveshaft Very intentional looking. This is about 1" dia.

D mckellar

The lip seal sits on the very narrow shoulder in advance of the scroll. A Speedisleeve is sometime fitted (I did it on mine) if that shoulder is not perfectly flat, but I don't recall it extending over the scroll to any significant extent.
Dave H
Dave Hill

Dave, I assume from your comment that you have or had a crankshaft pulley with scroll threads. I was beginning to wonder if I was seeing things. The threads on my pulley are definitely uniform and scroll in a direction that would feed oil back into the engine. I thought perhaps someone had cut them after market. I didn't observe how far or if the scroll threads extend under the lip seal. I'll be starting the engine in a few days so I'll see if I need to go the speedisleeve route.

Thanks

Tim
TW Burchfield

Yes, the scroll threads feed oil back into the engine, or are supposed to. The lip seal should run on the minimal flat zone in front of the scroll threads. There is an excellent article on all this written by Dave DuBois - XPAG Oil Leaks and iits Cures (or similar).
Dave H
Dave Hill

Dave,

I found Dave's articles (http://www.mg-cars.org.uk/imgytr/oilleaks.shtml) and nowhere in them is a crankshaft pulley scroll mentioned. The only scroll mentioned is the one at the rear of the crankshaft.

As I said above I've never seen a crank pulley with a scroll - it would tear up the rope seal.

Gene
Gene Gillam

I think we are at cross purposes here. The only scroll is at the rear.
Dave H
Dave Hill

Then it has to be a PO job.

Tim
TW Burchfield

Here's a photo of the pulley.

Tim

TW Burchfield

Speedi-sleeve or replace it, Tim.
Gene Gillam

Thanks Gene. While I was looking for another part in my restoration supply depot (cardboard boxes) I found a spare pulley in perfect condition with a smooth shaft. I'll install that. I wonder if the pulley pictured would work as planned with a rope seal rather than a lip seal. It was on the engine when I disassembled it. It is available if anyone wants to try it :-)

Tim
TW Burchfield

Some additional info that could be of interest on the speedi sleeve install from Bob Schapel, who likely came up with the idea-

http://www.mg-cars.info/mgtd-mgtf1500-bbs/rear-main-seal-201408311831323444.htm

or google "xpag speedi sleeve" and it should come up on first page
D mckellar

This thread was discussed between 28/03/2016 and 29/03/2016

MG TD TF 1500 index

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