Throttle Body Corrosion Repaint

[Socalerv]

Has anyone had success repairing and repainting the corrosion found on the throttle body adjacent to the plate?

Here is my thought going forward.

• Remove plate ( any tricks as they should be corroded)
• Tape off affected are for sanding and overspray
• Sand affected area of corrosion and clean
• Fill in recessed area with paint glaze
• Sand smooth, clean, clean
• Paint with Lingenfelter LT5 paint (rattle can)
• Repalce plate with new from ZR1 member and new gasket from Jerry's.

Probably need new bolts, where can I get them?

[Paul Workman]

Originally Posted by Socalerv

Has anyone had success repairing and repainting the corrosion found on the throttle body adjacent to the plate?

Here is my thought going forward.

• Remove plate ( any tricks as they should be corroded)
• Tape off affected are for sanding and overspray
• Sand affected area of corrosion and clean
• Fill in recessed area with paint glaze
• Sand smooth, clean, clean
• Paint with Lingenfelter LT5 paint (rattle can)
• Repalce plate with new from ZR1 member and new gasket from Jerry's.

Probably need new bolts, where can I get them?

Recommend you either bypass the TB, or block the coolant at the IH ports. Unless you're drive in sub-zero weather, you will not need TB heating, and the never-ending corrosion issue. Hasn't corroded again since!

As for screws, I got mine at Ace Hardware.

Just a thought.

P.

[Socalerv]

Are there "How To's" to bypass the coolant to the throttle body?

[Paul Workman]

Two ways to do it: the bypass or plugging. Either will work, but plugging allows you to remove some plumbing, and bypassing can be done without removing the plenum.

Bypass:

Remove the two curved rubber hoses that lead to the TB from connections on the plenum, and replace the two short tubes with a longer piece to connect the two plenum connections together. (The driver's side is a small elbow pipe between the #1 & 3 cylinder runners. The passenger side is a "T" connection.)

As for routing, some route the hose out and under the plenum, attaching it to the coolant cross-over pipe that is there. Or, some run a rubber hose under the plenum to connect the two IH connections together. Either will work.

__________________

Plugging off the coolant passage:

This requires removing the plenum to access the little coolant passages in the IHs that route coolant up through the plenum (to the afore mentioned connections). Drill and tap the holes and place an aluminum pipe plug, wrapped with Teflon tape.

Mine happens to be brass (aluminum would be better in the long run). Anyway, you can see the hex-hole'ed plug in my IH. That's there to shut off the coolant to the TB (one on each IH).



There is a line on the passenger side that comes up from the reserve tank area, runs along the plenum rail to the "T" connection on the passenger side of the plenum. Follow that rubber line back under the reserve coolant tank area, cut it and plug the hose (I used a metal shank from a bolt, wrapping the hose with a worm-type hose clamp and tie-wrapped it out of sight.) Remove the excess plumbing...OR DON"T! (I left the plumbing in place - gives the the motor more of a stock look. The choice is yours.).

A couple nice benefits for cutting off the coolant to the TB, in addition to the corrosion problem:

1. The plenum runs significantly cooler! Not a bad thing when trimming 1/10ths of your ET.
2. It can be argued too that the cooler temps could prolong the life of the DIS module (fastened to the plenum). Certainly won't do it any harm not to run so hot.
3. You never have to fuss with draining and re-filling the coolant before removing the plenum. It cuts considerable fussing around off, next time you need to get under the plenum for something. (AND, there WILL be another time...trust me)

Hope this helps.

Oh, if your wondering about the runner diameters being uniform, instead of the primary being smaller, it is because mine has the "FBI 500" package applied to it. hence the uniformity of the runner diameters.

P.

[PhillipsLT5]

http://zr1specialist.com/HAT%20Web/p...t%20bypass.htm

[Z51JEFF]

Originally Posted by PhillipsLT5

http://zr1specialist.com/HAT%20Web/p...t%20bypass.htm

I did the Haibeck bypass but there was just no way I could get it to come out the other side so I pulled the plenum,tweeked the bypass line to fit the way I wanted it too and put everything back together.When I had the plenum off for some reason I stripped just the top surface and painted my TB.I need to paint it again once I paint the TB to match my Carter TB plate.You cant find the screws anymore,maybe Jerrys got some.The TB plate in there now most likely is stuck,might break like mine did,good I had an NOS piece in my stash.

[Socalerv]

Originally Posted by Paul Workman

Two ways to do it: the bypass or plugging. Either will work, but plugging allows you to remove some plumbing, and bypassing can be done without removing the plenum.

Bypass:

Remove the two curved rubber hoses that lead to the TB from connections on the plenum, and replace the two short tubes with a longer piece to connect the two plenum connections together. (The driver's side is a small elbow pipe between the #1 & 3 cylinder runners. The passenger side is a "T" connection.)

As for routing, some route the hose out and under the plenum, attaching it to the coolant cross-over pipe that is there. Or, some run a rubber hose under the plenum to connect the two IH connections together. Either will work.

__________________

Plugging off the coolant passage:

This requires removing the plenum to access the little coolant passages in the IHs that route coolant up through the plenum (to the afore mentioned connections). Drill and tap the holes and place an aluminum pipe plug, wrapped with Teflon tape.

Mine happens to be brass (aluminum would be better in the long run). Anyway, you can see the hex-hole'ed plug in my IH. That's there to shut off the coolant to the TB (one on each IH).



There is a line on the passenger side that comes up from the reserve tank area, runs along the plenum rail to the "T" connection on the passenger side of the plenum. Follow that rubber line back under the reserve coolant tank area, cut it and plug the hose (I used a metal shank from a bolt, wrapping the hose with a worm-type hose clamp and tie-wrapped it out of sight.) Remove the excess plumbing...OR DON"T! (I left the plumbing in place - gives the the motor more of a stock look. The choice is yours.).

A couple nice benefits for cutting off the coolant to the TB, in addition to the corrosion problem:

1. The plenum runs significantly cooler! Not a bad thing when trimming 1/10ths of your ET.
2. It can be argued too that the cooler temps could prolong the life of the DIS module (fastened to the plenum). Certainly won't do it any harm not to run so hot.
3. You never have to fuss with draining and re-filling the coolant before removing the plenum. It cuts considerable fussing around off, next time you need to get under the plenum for something. (AND, there WILL be another time...trust me)

Hope this helps.

Oh, if your wondering about the runner diameters being uniform, instead of the primary being smaller, it is because mine has the "FBI 500" package applied to it. hence the uniformity of the runner diameters.

P.

Just to keep it simple for me what size of tap kit would I need?

[Paul Workman]

Originally Posted by Socalerv

Just to keep it simple for me what size of tap kit would I need?

The plug size isn't critical. It just has to be slightly bigger than the hole it has to plug. (if memory serves, mine was a 3/8", or about that size).

So, measure the hole, find the plug that is just slightly bigger, and then look for the matching tap. Then get the drill bit size recommended by the thread tap to prep the hole for the tap. (I'd send you mine, but I don't have any spare plugs, and my bit and tap may not match the size plug you might find. Anywayz, I got everything I needed at ACE Hardware.)

P.