Author Topic: To seal or not to seal??  (Read 1740 times)

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Offline Joe

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To seal or not to seal??
« on: February 03, 2012, 12:35:40 PM »
Hello everyone,
Let me start by saying it's a really CRAPPY time to not have a running bike in Phoenix AZ.  The weather is beeeeautiful right now.
  I am patiently waiting for my '76 750F parts to come home from the local machine shop, and I wanted to ask the experts what you think about using gasket sealer when putting the cylinder/head back together
  I bought a complete set of valves from cycle x, and in the box was a letter explaining the importance of using a good sealer like hondabond etc..  I have replaced the head gasket once before, and had no leaks using just a light coat of oil on the gasket.   Should I use a sealer just to be safe?

Offline Duke McDukiedook

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Re: To seal or not to seal??
« Reply #1 on: February 03, 2012, 01:11:23 PM »
A lot do not use sealer, if you do decide to use it very sparingly apply it.
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Offline Ernest T

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Re: To seal or not to seal??
« Reply #2 on: February 03, 2012, 03:23:17 PM »
I'm close to putting a 400F back together and I gather they tend to weep oil and was wondering if I shouldn't use sealer on the base and head gasket too.

Offline Gordon

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Re: To seal or not to seal??
« Reply #3 on: February 03, 2012, 04:03:13 PM »
I'm close to putting a 400F back together and I gather they tend to weep oil and was wondering if I shouldn't use sealer on the base and head gasket too.

They don't tend to weep oil. 

This is one of those issues where it's strictly a matter of personal choice.  Many, including myself, use no sealer at all on any of the gaskets and have not had any leaks from a rebuilt/refreshed engine.  Many use a sealer and have also not had any leaks, but you run the risk of using too much and causing top end oil starvation if one or more of the passages gets clogged. 

The bottom line is if you choose to use a sealer, use it very sparingly, but don't think that it's a necessity.   

Offline lucky

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Re: To seal or not to seal??
« Reply #4 on: February 03, 2012, 04:23:00 PM »
Hello everyone,
Let me start by saying it's a really CRAPPY time to not have a running bike in Phoenix AZ.  The weather is beeeeautiful right now.
  I am patiently waiting for my '76 750F parts to come home from the local machine shop, and I wanted to ask the experts what you think about using gasket sealer when putting the cylinder/head back together
  I bought a complete set of valves from cycle x, and in the box was a letter explaining the importance of using a good sealer like hondabond etc..  I have replaced the head gasket once before, and had no leaks using just a light coat of oil on the gasket.   Should I use a sealer just to be safe?

Do NOT use gasket sealer on the cylinder head gasket!
When Cycle-X was talking about Honda bond or Gaskacinch that is to be used on the case halves,not the cylinder head.
The cylinder block to engine case has a paper gasket, and you CAN use Gaskacinch on that, but not on the cylinder head to cylinder junction.
Be careful not to put so much on that it clogs up a oil drain or oil galley hole.

On the alternator cover just put Gaskacinch on one side use some Vasoline on the other side of the gasket case you need to remove that cover some time without ruining the gasket.

On the shifting drum case use sealer on both sides. You will not need to take that off.

Also do not put anything on the points cover. On the points cover just use a little Vasoline on that and the cork gasket should already be glued to the inside of the points cover. That way the cover comes off for timing the engine easily. Ther should be no oil in that area anyway.

Offline Danno

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Re: To seal or not to seal??
« Reply #5 on: February 04, 2012, 01:36:13 AM »
like lucky said it is a bad idea to use sealer on the head gasket if sealer is to be used I only put it on the case gaskets
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Offline Ernest T

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Re: To seal or not to seal??
« Reply #6 on: February 04, 2012, 07:39:40 AM »
like lucky said it is a bad idea to use sealer on the head gasket if sealer is to be used I only put it on the case gaskets

So, we're not talking about the sealer between the case halves, but the left and right side covers?

Offline Joe

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Re: To seal or not to seal??
« Reply #7 on: February 04, 2012, 10:03:50 AM »
Dear Ernest T,

Please start your own topic. ;)

Thanks a bunch for the info Lucky.  That's exactly what I was looking for.  Gotta get back to the shed and fix a leak in my bicycle tire now.  Unfortunately it will be my ride for the Love Cycles party tonite.......seriously bummed :( :( :(