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  #11  
Old 12-16-2008, 02:44 PM
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hot. add a couple thousanths for cold.
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  #12  
Old 12-16-2008, 07:17 PM
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OK, I tried UncleBen's hammer remedy with no luck. What the heck, we knew it was a long shot right?

So I rigged the 100 psi air hose into the spark plug hole with the piston at TDC.

I have the carb off and #4 intake is right there by the carb mount and there was not a drop of air coming from there.

There was quite a bit coming from the exhaust, if I put my hand over the exhaust pipe I could feel it build pressure and start leaking by the muffler, so the exhaust valve is definitely leaking.

There was nothing coming from the crank case vent hole, but a real small amount coming from around the pushrods near the #4 valves. So I'm thinking burned or cracked exhaust valve and the piston/rings are probably in the same shape as the other jugs.

Question: I called Burt and Stevenson and they're telling me the head gasket is no longer available. I can get the entire valve job gasket set from JTO for $60 should I just go that route? Also, JTO sells exhaust and intake valves. Should I go ahead and get a couple of each or will the place that rebuilds my head be able to get valves?
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  #13  
Old 12-16-2008, 07:59 PM
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I'd say Mountain High performance also. That is who did my valves, head and manifold. they were great and the price was good.
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  #14  
Old 12-16-2008, 10:54 PM
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You don't have to send your head out if you'd rather do the work yourself. It's pretty low tech. I used to send my heads out, but after I did my own this last time it was like Doh'

I have the special valve spring compressor for these heads and would be happy to loan it to you. But that's getting a little ahead of the project. Pull the head and have a look see as to what the root cause of your low compression is. If it's a burnt up exhaust valve, I may have one hanging around you can have for free, otherwise they are normally sold in sets if you have to buy new.

As far as head gaskets, that would totally suck if Toyota discontinued them. I've been buying them new from our supporting dealers for years. And while I've used after market from time to time, OEM has always been best in my experience. Same with manifold and oil pan gaskets.
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  #15  
Old 12-17-2008, 08:41 AM
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Jeff,

Back in my younger days when I did it for a living, I used to use that type of tool to tear heads down. However, we also had the tools to grind the valve seats, lap the valves not being replaced, and knurl & ream the valve guides.

I'm just thinking if I go to all the trouble to pull the head, I want to get the valve guides done, new seals, re-seat the valves and check/mill the head to remove any warp that has developed over the years.

I'm also installing a header when I put it back together, so I guess I need to get my intake machined too.

I was surprised about the parts not being available from Toyota too. But I spoke to Burt, Stevenson and GO and got the same story: They can get the valve cover gasket but head gaskets for 1974 F are no longer available
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Old 12-17-2008, 09:18 AM
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Quote:
Originally Posted by Rzeppa View Post
You don't have to send your head out if you'd rather do the work yourself. It's pretty low tech. I used to send my heads out, but after I did my own this last time it was like Doh'

I have the special valve spring compressor for these heads and would be happy to loan it to you. But that's getting a little ahead of the project. Pull the head and have a look see as to what the root cause of your low compression is. If it's a burnt up exhaust valve, I may have one hanging around you can have for free, otherwise they are normally sold in sets if you have to buy new.

As far as head gaskets, that would totally suck if Toyota discontinued them. I've been buying them new from our supporting dealers for years. And while I've used after market from time to time, OEM has always been best in my experience. Same with manifold and oil pan gaskets.
Jeff,
Thats fine if your just lapping the valves, cleaning everything up and replacing seals and gaskets. On an older motor with a Kazillian miles the guilds are probably oblonged and the head surface is no longer flat. Unless you have a mill and guild press tools your shadetree freshen up just will not last. Besides that it sounds like he probably has a burnt exhaust valve in #4 which means the seat might need replacement also.

I do agree with you on the easy part of freshing a head.....lapping is pretty fun actually!
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  #17  
Old 12-17-2008, 06:07 PM
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Wasn't it Subzali that discovered last year you could get the head gasket from a forklift parts supplier? Not sure if that was only for a 2F though? Since I can't follow much else of this discussion that is all I have to offer
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  #18  
Old 12-17-2008, 07:40 PM
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Ricardo and I got the head off tonight. It went amazingly well, no broken bolts, etc. Looking at the head, all of the valves look OK externally. Could still be a cracked seat or something like that though.

The other thing I noticed is a discoloration between the #4 and #5 cylinder. I see it on the head gasket and on the block surface too. Im thinking I could have had a bad head gasket leaking compression over into #5.

I did the shade tree leak down test and brought #4 piston up to about below TDC and filled the cylinder with kerosene. It held the liquid for 15 minutes with virtually no leak down. All the other cylinders tested the same, so nothing obvious as far as broken piston or rings. Im taking the head in tomorrow so Ill learn soon enough if there are any issues there.

Ricardo also took some pictures of the suspicous area on the head.

To Ricardo I say "you rock dude" Thanks for coming all the way down to help out. And thanks for the good fellowship and conversation. Any time you need a hand or a place to work you know you are always welcome here!
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  #19  
Old 12-18-2008, 07:50 AM
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Be sure to check your block deck, then. You may need to deck it - not the end of the world, but you may as well do a complete overhaul for not much more (if you do all the labor short of machining yourself).

Then you will have an F that produces the same earth shattering power it did when new!





Oh...
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  #20  
Old 12-18-2008, 08:18 AM
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Quote:
Originally Posted by Red_Chili View Post
...
Then you will have an F that produces the same earth shattering power it did when new!





Oh...
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