Chrisp Rapier
Donation Time
I obtained a top end gasket set for my 1959 Rapier. included in the set are 2 items listed as "Hot Spot". Any idea of how they are used and where? They are specifically called out to be used on Rapiers.
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Gasket Set "Hot Spot" Items
- Thread starter Chrisp Rapier
- Start date
Chrisp Rapier
Donation Time
The "Hot Spot" pieces are the white arrow shapes. They are a very thick insulative type material.
husky drvr
Diamond Level Sponsor
Chrisp,
I'll try to find a set of iron head manifolds to check, but I think the term "Hot Spot" indicates the part(s) in question are used between the intake and exhaust manifolds where they are connected together. Two external bolts and one through bolt for the connection.
Maybe,
Chrisp Rapier
Donation Time
Thanks for that. The carburetor intake rests on top of the exhaust manifold. These triangles are located on a "pin" on the manifold and are an insulator. Perfect! I get it!!
Chrisp Rapier
Donation Time
There is also this thick insulative gasket in my set. I presumed this was for the fuel pump, to insulate the fuel from the hot block. However there is also a cover plate on the block of exactly the same shape. Which is it I wonder? My list of parts on the gasket set does not call out a gasket for the fuel pump.
husky drvr
Diamond Level Sponsor
[QUOTE="Chrisp Rapier, post: 228178, member: 12858"
There is also this thick insulative gasket in my set. I presumed this was for the fuel pump, to insulate the fuel from the hot block. However there is also a cover plate on the block of exactly the same shape. Which is it I wonder? My list of parts on the gasket set does not call out a gasket for the fuel pump.[/QUOTE]
Chrisp,
You're correct, the thick one is for the fuel pump. It looks like it might already have a gasket attached on both sides. Maybe someone will chime in about the need of a gasket(s) in addition to the insulator.
The other location is an alternate location for the fuel pump. I'm not sure I've ever seen that position used. It's probably for a different, not imported model( Commer) or an earlier, discontinued model. It was about that time period when blocks and cams stopped being cast with the second mounting position.
Hope this helps,
There is also this thick insulative gasket in my set. I presumed this was for the fuel pump, to insulate the fuel from the hot block. However there is also a cover plate on the block of exactly the same shape. Which is it I wonder? My list of parts on the gasket set does not call out a gasket for the fuel pump.[/QUOTE]
Chrisp,
You're correct, the thick one is for the fuel pump. It looks like it might already have a gasket attached on both sides. Maybe someone will chime in about the need of a gasket(s) in addition to the insulator.
The other location is an alternate location for the fuel pump. I'm not sure I've ever seen that position used. It's probably for a different, not imported model( Commer) or an earlier, discontinued model. It was about that time period when blocks and cams stopped being cast with the second mounting position.
Hope this helps,
Chrisp Rapier
Donation Time
Chrisp,
You're correct, the thick one is for the fuel pump. It looks like it might already have a gasket attached on both sides. Maybe someone will chime in about the need of a gasket(s) in addition to the insulator.
The other location is an alternate location for the fuel pump. I'm not sure I've ever seen that position used. It's probably for a different, not imported model( Commer) or an earlier, discontinued model. It was about that time period when blocks and cams stopped being cast with the second mounting position.
Hope this helps,[/QUOTE]
Ahhh. Interesting about the second fuel pump location. I was wondering about the cap. I made a paper gasket for the cap and installed it with sealant. barring any imput I will just use the gasket sealant on the fuel pump insulator gasket. Thank you for your insight.
husky drvr
Diamond Level Sponsor
Chrisp,
Just an informational note, the WSM says that the two manifolds should be torqued to the head BEFORE torquing the two manifolds together. This helps ensure both manifolds seat to the head correctly.
Hope this helps,
Chrisp Rapier
Donation Time
Good to know. I did not know that. Thank you.
With regards to the fuel pump spacer/gaskets. The thick spacer goes between pump and block, gaskets are used to space out the pump to get correct pressure from the pump.
Spacing the pump out moves it away from the cam lobe, so that pump lever arm reduces stroke (pressure) , moving the other way obviously has the opposite effect.
That's the official line, in my experience I've only ever used the spacer and one gasket and get about 2 psi out of the pump.
Spacing the pump out moves it away from the cam lobe, so that pump lever arm reduces stroke (pressure) , moving the other way obviously has the opposite effect.
That's the official line, in my experience I've only ever used the spacer and one gasket and get about 2 psi out of the pump.
Chrisp Rapier
Donation Time
Thanks I was wondering what the spacer does to the geometry of the lever.