FRONT model A ‘modern’ seal use.

Re: FRONT model A ‘modern’ seal use.

Patrick L. said:
I use the rope seal successfully.
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Hey Patrick,
Tthanks, but I ask and need to know about whether others here can give me important feedback regarding use / efficacy of the modern front seal that is designed for possible better sealing at front of crank.
 
Re: FRONT model A ‘modern’ seal use.

The modern shaft seal ("Simmering") can only be fitted if the entire front housing and the oil pan has been removed.



I also used the ropes mentioned by Patrick. When installed correctly, they provide a very good seal. There is only a slight oil mist on my car, always less than 1 drop. (The oiling out is much worse at the back of the crankshaft!)
 
Re: FRONT model A ‘modern’ seal use.

I have not used one myself even though I bought one to use on my engine rebuild but ended up keeping the rope. But I have heard (for what it is worth) that guys have had leaks with rope seals and modern seals with and without sealant. I think it all depends on installation and care not to damage the neoprene for sure. Some timing covers and oil pans have more sharp areas than others IMO.
 
Re: FRONT model A ‘modern’ seal use.

I have used one for 28,000 miles in my Tudor. No leak yet. Put it in with black rtv.

John
 
Re: FRONT model A ‘modern’ seal use.

hardtimes said:
Hey Patrick,
Tthanks, but I ask and need to know about whether others here can give me important feedback regarding use / efficacy of the modern front seal that is designed for possible better sealing at front of crank.
Click to expand...




I know, I answered because over the years I've read mixed results about this seal.
 
Re: FRONT model A ‘modern’ seal use.

I have used in at least 10 engines with great success. Now I have one that leaks, I am pulling the oil pan and replacing the seal later this month. I think the pan is the culprit in this leak. That seal that failed immediately and I am not looking forward to all the work to change it, as it requires lifting the engine after pulling the radiator etc. to remove the pulley. I am replacing it with another modern seal.
 
Re: FRONT model A ‘modern’ seal use.

May want to look into the Stipes Specialty Motor Cams modern seal if using one. The original asbestos soaked ropes were reliable but no longer available. A smooth unpainted pulley shaft is essential.
 
Re: FRONT model A ‘modern’ seal use.

duke36 said:
A smooth unpainted pulley shaft is essential.
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It is imperative that the surface of the pulley that the seal rides on is absolutely smooth.
This is especially true when using a new pulley. The fine machining marks on the pulley will ware out the lip of the seal and cause it to fail prematurely.

I polish this surface when I assemble an engine.

Chris W.
 
Re: FRONT model A ‘modern’ seal use.

I helped a friend put one in. He was told to not us rtv when installing it and it imediately leaked. We removed the seal and filled top and bottom with channel with rtv, pushed seal into place and it quit leaking. We used paper pan gaskets with a smear of rtv on the pan side only and torqued the bolts evenly, just tight. So far so good.
 
Re: FRONT model A ‘modern’ seal use.

duke36 said:
May want to look into the Stipes Specialty Motor Cams modern seal if using one. The original asbestos soaked ropes were reliable but no longer available. A smooth unpainted pulley shaft is essential.
Click to expand...

I bought a Stipes front seal to hopefully cure a front seal leak on my engine. Very nice piece but I have never used it. My seal leak was cured when I installed a balancer with a reverse scroll machined into it. Not a drop since.

http://www.specialtymotorcams.com/detail.php?s=model-a-front-seals-011
 
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Re: FRONT model A ‘modern’ seal use.

Hi Rick,

Look into the Stipe modern front seal. It uses an aluminum housing to hold the shape.
 
Re: FRONT model A ‘modern’ seal use.

I’ve used over 300 of them on our engines. Had a couple leak, all the rest have not. Must use a new or very smooth pulley and be sure it Is centered and held in place with Ultra black.
 
Re: FRONT model A ‘modern’ seal use.

SteveB31 said:
I’ve used over 300 of them on our engines. Had a couple leak, all the rest have not. Must use a new or very smooth pulley and be sure it Is centered and held in place with Ultra black.
Click to expand...

Any preference or results for a 1 piece vs. a 2 piece pulley ? Are the threaded type 2 piece pulleys acceptable as well?
 
Re: FRONT model A ‘modern’ seal use.

I would only go with 1 piece pulleys - it seems the 2 piece pulleys coming apart is a real problem.
 
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