manifold

[markfritsch]

my long block is on an engine stand. rebuilt and balanced .I took my manifold apart to put in a new heat sheild and gaskets and to clean everything up. I found carbon in the intake manifold. after cleaning off the carbon found there was a crack right in the middle of those ribs on the inside of the intake manifold. the exhaust manifold is'nt looking too good either. all well , i'll just have to save up for a set of new ones. $820 from toyota for my 1985 60 series. My mechanic friend says I should remove that heat activated choke plate thing in the manifold to let the engine breath easier. any comments? thanks mark

 

[2mbb]

I wouldn't remove the plate. it's my understanding that it opens when cold to let the hot exhaust gases get under the intake manifold to pre-heat the incoming gases. When the engine is hot the flap directs the exhaust gases away from the intake. When warm, i don't think it's creating a restriction (gases flow straight through instead of up and around), and without it you might suffer from overheating the incoming gases.

 

[AfricanToy]

my long block is on an engine stand. rebuilt and balanced .I took my manifold apart to put in a new heat sheild and gaskets and to clean everything up. I found carbon in the intake manifold. after cleaning off the carbon found there was a crack right in the middle of those ribs on the inside of the intake manifold. the exhaust manifold is'nt looking too good either. all well , i'll just have to save up for a set of new ones. $820 from toyota for my 1985 60 series. My mechanic friend says I should remove that heat activated choke plate thing in the manifold to let the engine breath easier. any comments? thanks mark

Very common problem with the intake manifold (crack down the middle of the pendulum), try and find a good used one , otherwise a machine shop could do some welding?

agree with last person, you shouldn't mess with what Toyota set it up with. Be sure to use a tap to clean out all the threads and make sure the four bolts are put in tight (with blue locktight) before putting the carb gaskets on.

 

[hank14]

You should be a ble to get one for the $650 range new, if you decide to go that route, from American Toyota (cruiserdan here on mud). I would try for a used one, though and have it checked out by a machine shop.

 

[Cruzerman]

My 40 had the same crack on the intake. Took it to a welding shop and got it welded. That was 15 years ago.

 

[lehiguy]

Just one more reason to get a header.

 

[cruiser88]

Just one more reason to get a header.

yeppers

 

[Spike Strip]

Mark, where are you located ? I'm in So Cal, so I did use a "block off plate" from $OR to lock that butterfly valve in the open position and limit the heat on the intake - hopefully preventing that crack. But if you're in a cold climate, you'd be best to let that valve alone, particularly if you're planning on buying a new one.

I had mine machined and fixed for about $300.

1sttoyotaparts.com lists the manifold assy at $548.36 cruiser dan will be about the same.

Part # 17100-61084 for 9/82-8/87 FJ60

Also note, that if you need to pass smog, that valve has to be intact (or look intact) - and if you don't have to worry about smog, then get a good header.