Porous timing cover

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I have an infamous porous 850 timing cover (all around the Norton logo many tiny pores sweating out engine oil). Andover Norton only offers a new MK3 timing cover which I don't like so I really want to keep the original cover. Is there currently a cure available for these porous alloy castings like a coating on the inside of the cover :?:
 
You need to get all the oil out of the cover by degreasing, washing, heating etc. When its completely clean and dry, treat the inside and outside liberally with Loctite 290. That will fix it.
 
nortonspeed said:
I have an infamous porous 850 timing cover (all around the Norton logo many tiny pores sweating out engine oil). Andover Norton only offers a new MK3 timing cover which I don't like so I really want to keep the original cover. Is there currently a cure available for these porous alloy castings like a coating on the inside of the cover :?:
Click to expand...

I use the original method norton used most of the time. Having stripped gasket material off of timing covers and gearbox covers using methylene chloride (paint stripper) I found there was a light silver coating (paint?) on the inside cast surface...which is very similar to the coating on all later NHT crankcases. Why was it there??? maybe to seal the porosity? I've been doing it since the late 80's.
I still sleep OK at night even though some people don't believe me.
 
Stripper on the gasket surface went down on the inside of the covers. Wipe the stripper off the inside and the paint also comes off on the rag and you have a bare surface ie no more silver coating. it's now on the rag. I've told this story several times during the last 15 years. Though I did this around 1988-89.I did not want a thick full bodied paint coating, just a thinned out shot of acrylic enamel silver paint seals it up again.
If done well you can't tell.
 
Try these folks, I have been in their Muncie shop and they do ultrasonic cleaning and vacuum impregnation of castings, motor windings, etc.

www.magnatechmfg.com

I don't know if they will do the impregnation for private individuals but I would recommend a call.

Dave
 
Years ago I used MEK to strip and clean the inside of the timing cover on my 73 850. I used HI-Temp silver header paint as a sealer. It was still working 35,000 miles later.
 
Don
When you say "treat liberally" with Loctite 290 - exactly how do you do that?
The product sheet you posted says:

For Porosity Sealing
1. Clean area and apply localized heat to the area to approximately 121°C.
2. Allow to cool to approximately 85°C and apply the product.

What method do you use to apply the product, bearing in mind 85°C is still a bit too hot to touch?

Otherwise it appears a good precaution during a rebuild using these old and potentially porous castings!

Cheers
Rob
 
amongst other things I sealed a Triumph timing cover with Loctite 290.
After cleaning I emptied about 30 - 50ml inside the cover and swirled it around for a little while making sure I got
full coverage of the inside of the cover.
That stuff is very thin and the cover will absorb the 290 into every porous hole or crack no matter how small.
Thats what its designed for.
 
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