What is it? F.5 exhaust manifold 2nd outlet

[7sandEights]

Hey, I'm trying to figure out what the hole in the forward exhaust manifold is on the motor I recently bought. Out of a 1974 FJ40. My best guess is it was tied into the air cleaner to feed hot air to the carb for cold weather? Is it OEM? Anyone?

 

[Pighead]

My best guess is it was tied into the air cleaner to feed hot air to the carb for cold weather? Is it OEM? Anyone?

Yep, exactly right.

 

[cstav86]

Yes, OEM. If you have the original air cleaner it should have a pipe off the inlet neck that connects to pull warm air off the manifold. That’s a pretty rare part as most of them are rusted out and ditched.

 

[7sandEights]

Very interesting. I am wondering if there was a valve that controlled the intake depending on temp?
Unfortunately, I don't have the air cleaner

 

[Pighead]

Very interesting. I am wondering if there was a valve that controlled the intake depending on temp?

There was a flapper type valve with a temp sensitive thingy in the air cleaner intake that directed air flow differently when warm or cold.

 

[charliemeyer007]

On a lady friends helix back in 70's it had a manual sliding selector plate for winter or summer mode. I think it would operate anywhere in between those modes.

 

[timmyisinthewell]

From what I see on my Toyota microfiche, the part you questioned didn't show up until 01/75 on the 2F engine and doesn't appear to have been used on a '74 engine. Check your engine number to properly date your engine build date. Also you should have a bi-metal coil spring ID'd as 17231b with a valve ID'd as 17231.

 

[JohnnyC]

@timmyisinthewell

I believe it came standard in 75’+ Canada… before that it was optional … I do think it was either 72/73 started but could have been earlier … I’d have to check … mine (upper north east 74’) had this before I went to headers

 

[JohnnyC]

Found this:

 

[7sandEights]

From what I see on my Toyota microfiche, the part you questioned didn't show up until 01/75 on the 2F engine and doesn't appear to have been used on a '74 engine. Check your engine number to properly date your engine build date. Also you should have a bi-metal coil spring ID'd as 17231b with a valve ID'd as 17231.

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Thanks for this!
It's a F.5 engine from what I can tell(relocated engine oil filter) from a 74 but I'll check engine codes. block is 11411-60032

 

[7sandEights]

@timmyisinthewell

I believe it came standard in 75’+ Canada… before that it was optional … I do think it was either 72/73 started but could have been earlier … I’d have to check … mine (upper north east 74’) had this before I went to headers

I'm in Canada so this makes sense. I didn't realize it is just a cover over the exhaust to pull heat from the head. I thought it was part of the header but now I know.

 

[JohnnyC]

Your engine number is on the ledge right above the starter

You also have the vacuum retard dizzy… ditch it and get a vac advance

 

[7sandEights]

Engine number is F 563795

 

[JohnnyC]

Your engine is 100% a 74’ F and a half engine … 10/74

 

[cstav86]

From what I see on my Toyota microfiche, the part you questioned didn't show up until 01/75 on the 2F engine and doesn't appear to have been used on a '74 engine. Check your engine number to properly date your engine build date. Also you should have a bi-metal coil spring ID'd as 17231b with a valve ID'd as 17231.

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My 11/74 F1.5 had it so it must have been earlier than that.

 

[Pighead]

From what I see on my Toyota microfiche, the part you questioned didn't show up until 01/75 on the 2F engine and doesn't appear to have been used on a '74 engine. Check your engine number to properly date your engine build date. Also you should have a bi-metal coil spring ID'd as 17231b with a valve ID'd as 17231.

You're looking at the valve in the exhaust manifold under the intake manifold...