Repair of corroded engine block with JB Weld

[Dave Kase]

CHEERS K!

Dave Kase

kbogach wrote:

> It worked great.  The surface where WP's  is bolted looked beautiful 
> and silky smooth after filing..  Thanks for advise.  I would not dare 
> doing that without an advise of experienced people because I would be 
> afraid of thermal expansion/contraction effect.    Silicon sealant 
> does not work well because you have to move the pump to adjust timing 
> belt tension.  .
>
> Thanks all,  John Larson and Dave Kase  especially.
> Konstantine.
>
> Dave Kase wrote:
>
>> This is a good idea.
>> When you file, lay a single cut flat file flat on the surface and use 
>> a circular pattern to smooth it out.  I also use a liquid with this 
>> (I use Purple Power - somehow a cleaner seems to be the right thing 
>> to use).  Just spray the area as you are filing.  This helps keep the 
>> file and surface clean.
>>
>> Once you get close to fully smooth I switch over to a sharpening 
>> stone.  Again with the circular pattern and spraying with a cleaner 
>> as you go.  I use the stone method for cleaning any machined surface 
>> prior to assembly - it works great.
>>
>> As far as a wider seal - someone was doing this on 20v -7A water 
>> pumps.  I don't agree with this method.  Once you have a smooth 
>> surface, just coat the o-ring with Vaseline or other clear grease and 
>> install it in the water pump groove.  This will allow the pump to 
>> slide on the surface without pinching the o-ring.  This is a 
>> regularly used method in the aircraft industry to minimize o-ring 
>> pinching.
>>
>> Good luck,
>> Dave Kase
>> A&P licensed mechanic (now mechanical engineer)
>>
>>
>> kbogach wrote:
>>
>>> That's is a great news for me that JB Weld can be used to  this.   
>>> Thank you.
>>> Konstantine
>>>
>>> John Larson wrote:
>>>  
>>>
>>>> You asked "
>>>>
>>>> Any comments will be greatly appreciated. Anyone machined WP's 
>>>> gasket groove for thicker gasket?  How much it can cost in a 
>>>> machine shop?   The surface on block is pitted and I have to use 
>>>> hight temp silicon gasket goop.  Last time it held 2 years only."
>>>>
>>>> I can't address the alignment issue today, but there's a simple, if 
>>>> a bit time consuming, solution for the block erosion behind the 
>>>> water pump.  After getting it REALLY clean, apply a coat of JB Weld 
>>>> to the pitted area (use the regular, not the fast drying type), let 
>>>> it cure for 24 hours, and carefully file it flat.  Clean it off 
>>>> well, and apply another layer if necessary.  It works.  BMW 
>>>> authorizes this technique for pitted cylinder heads, and I do it to 
>>>> Vanagon heads all the time.  RTV, BTW, is a really poor way to fix 
>>>> ANY kind of leak.  Be sure to use the correct phosphate free 
>>>> coolant after the repairs.  Good luck, John
>>>>
>>>>     
>>>
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