Stainless idle screw upgrade
Dec 12, 2010 | 09:02 AM
#1
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Joined: May 2008
Posts: 103
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From: Bethel, PA
Stainless idle screw upgrade
Well a while ago adjusting my idle i broke one of the adjustment screws, and walking around home depot i found the prefect replacement. Here is the broke screw.
So i went to home depot and bought 2 sets of these 10/32x 1in.(only needed one set)
Tools needed are 2.5mm allen wrench, 3mm allen wrench, and 8mm open ended wrench.
It's pretty straight forward, take old out put new in.
It's not a big mod in any way, just thought i'd post it incase anyone else broke a screw and was going to replace with stock set screw, these are much stonger than the stock screws and they look better.
So i went to home depot and bought 2 sets of these 10/32x 1in.(only needed one set)
Tools needed are 2.5mm allen wrench, 3mm allen wrench, and 8mm open ended wrench.
It's pretty straight forward, take old out put new in.
It's not a big mod in any way, just thought i'd post it incase anyone else broke a screw and was going to replace with stock set screw, these are much stonger than the stock screws and they look better.
Dec 15, 2010 | 07:03 AM
#2
One of those screws is for the dashpot is it not? I adjusted the one that contacts the dashpot as I suspected it was messing up the throttle plate relapse. Seemed to help a bit for me.
Last edited by 99blackSE; Dec 15, 2010 at 07:06 AM.
Dec 15, 2010 | 09:10 AM
#3
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Joined: Sep 2007
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From: San Francisco East Bay
I'm going to guess that Toyota didn't plan on using an SAE threaded component there.
Fortunately, 10-32 is a little smaller (4.95mm) than the m5x0.8 Toyota used, so you were able to get it in. But since it is smaller than design, you might have an issue with it vibrating loose. Who knows?
My local Ace Hardware has a stack of trays with "unusual" fasteners, including m5x0.8 - 25 button-head stainless. (And lots of other metric sizes) You might be able to wait and see, but since the 32 pitch isn't quite right (0.79mm) it's not doing the threaded part of the throttle arm any good.
Fortunately, 10-32 is a little smaller (4.95mm) than the m5x0.8 Toyota used, so you were able to get it in. But since it is smaller than design, you might have an issue with it vibrating loose. Who knows?
My local Ace Hardware has a stack of trays with "unusual" fasteners, including m5x0.8 - 25 button-head stainless. (And lots of other metric sizes) You might be able to wait and see, but since the 32 pitch isn't quite right (0.79mm) it's not doing the threaded part of the throttle arm any good.
Dec 15, 2010 | 01:11 PM
#5
Looks like the same screw to me, that is the one that contacts the dashpot.
From 4Crawler:
Dash Pot:
The GREEN CIRCLE shows the dash pot (DP) which is there to slow the closing of the throttle to prevent backfiring. It consists of the round air bellows, a spring loaded plunger, and the air vent line that attaches to the fitting at the base of the bellows. The vent line has a check valve in-line and an air filter to keep dirt out. The check valve lets air into the bellows then the throttle opens and extends the plunger. When the throttle closes, the stop screw contacts the plunger and pushes it in. The check valve closes to slow the air escaping the bellows and thus slow the closing of the throttle.
The GREEN CIRCLE shows the dash pot (DP) which is there to slow the closing of the throttle to prevent backfiring. It consists of the round air bellows, a spring loaded plunger, and the air vent line that attaches to the fitting at the base of the bellows. The vent line has a check valve in-line and an air filter to keep dirt out. The check valve lets air into the bellows then the throttle opens and extends the plunger. When the throttle closes, the stop screw contacts the plunger and pushes it in. The check valve closes to slow the air escaping the bellows and thus slow the closing of the throttle.
Last edited by 99blackSE; Dec 15, 2010 at 01:15 PM.
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