C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

TPS screw size?!?!

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Old Mar 9, 2007 | 11:37 AM
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Default TPS screw size?!?!

Anyone know the thread size and pitch of this very hard to find aluminum screw?
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Old Mar 9, 2007 | 12:39 PM
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4.5 mm. You can try Street and Performance www.hotrodlane.cc - Someone around here found something at Home Deport several years back.
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Old Mar 9, 2007 | 12:41 PM
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A size or p/n for the '89 TPS screw does not appear to be listed.
However, there is a reference to kits that are supposed to include
the fasteners for the TPS, the IACV and the top plate (Clean Air Cvr).

17110840 ('85-'89) FASTENER ASSORT KIT, INCL #21, #22, #42, #62
17112369 ('90-'91) FASTENER ASSORT KIT, INCL #21, #22, #42, #62

The p/n's are both GM & ACDelco. The 0840 does not come up at
GMPD or RA, but the 2369 does - roughly $16. GMPD calls this
a 'Multiport Fuel Injection Throttle Body Seal' while RA calls it a
'Fuel Injection Throttle Body'

I do not know how the fasteners changed for the '90-'91.

FWIW - the #17111606 TPS sensor kit for the '85-'89 indicates that
the screws and washers (#21 & #22) are included. About $38-$46.

.
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Old Mar 9, 2007 | 12:41 PM
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Forget Ace Hardware... at least the one here, I already tried there.
Those little guys have a lot of 'TPI' on'em.

They like to stick and be drilled out too so be sure and put 'anti-squeeze' on them when you replace them.
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Old Mar 9, 2007 | 12:46 PM
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Originally Posted by SunCr
4.5 mm.
4.5? Is this the diameter or possibly a variation of the pitch (0.45)?

Here is a selection of available sizes as per McMaster-Carr. Look under
Metric Bolts

Thread Size
M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10

Metric Thread Pitch
.35 mm | .4 mm | .45 mm | .5 mm | .6 mm | .7 mm | .8 mm | 1 mm | 1.25 mm | 1.5 mm
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Old Mar 9, 2007 | 01:23 PM
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I need to double-check the pitch, but a 58mm TB here with an
unknown past has two slotted machine screws/bolts with the following
characteristics:

- slotted pan head: M4.5 x .75 x 27mm (1-1/16" long)

(Edit: changed from M4 x .7 x 27 mm (1-1/16" long))

These are magnetic, so they are not aluminum.

.

Last edited by Slalom4me; Mar 9, 2007 at 02:10 PM.
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Old Mar 9, 2007 | 02:08 PM
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Oops.

SunCr is correct, the TPS bolt/screw appears to have a M4.5 x .75 thread.

.
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Old Mar 9, 2007 | 02:36 PM
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Around here Fleet Farm has drawers of bolts like that.
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Old Mar 9, 2007 | 03:18 PM
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Forget about searching for that bastard size. Retap and use stainless allen heads.
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Old Mar 9, 2007 | 04:51 PM
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Originally Posted by VetNutJim
Forget Ace Hardware... at least the one here, I already tried there.
Those little guys have a lot of 'TPI' on'em.

They like to stick and be drilled out too so be sure and put 'anti-squeeze' on them when you replace them.

Must be just your Ace Hardware. I picked up a set of these exact screws there. Forgot the size though. Indeed the anti-sieze is a smart idea.
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Old Mar 9, 2007 | 07:01 PM
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Damn ACE hardware just closed for the day. Maybe tomorrow morning I can grab a few. But thanks for the wealth of info!
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Old Mar 9, 2007 | 07:10 PM
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Originally Posted by Slalom4me
Oops.

SunCr is correct, the TPS bolt/screw appears to have a M4.5 x .75 thread.

.
I remember that one inparticular. Where to get em? Dunno. Might be a junkyard only item. There's probably tons of GM cars with TPS sensors with the same screws.
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Old Mar 9, 2007 | 09:57 PM
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Well, the last new TPS I bought came with them.
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