Engine Plug size for 4.2l intake manifold
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Engine Plug size for 4.2l intake manifold
CJ
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'82 CJ8, 258, D300, AMC20, D30
It looks like 3/8" or 1/2" NPT (hard to tell by using your finger as a gauge and it's NPT because the adaptor is not bottomed out) but why not get a couple of 1/8", 1/4", 3/8" and 1/2" NPT plugs @ the hardware store? They are very cheap and it never hurts to have a few laying around.
Manic Mechanic
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- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
Why do you want to plug it? That's a water jacket port for temp gauge
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Sent from my E7110 using Tapatalk
CJ
Admin
- Posts
- 22,331
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- 762
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- 193
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- Location
- Central FL
- Vehicle(s)
- '72 CJ5, 401, T18, D20, D44, D30
'82 CJ8, 258, D300, AMC20, D30
I just answer... 
Manic Mechanic
Full Time Jeeper
- Posts
- 1,880
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- 34
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- 10
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- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
CJ
Admin
- Posts
- 22,331
- Media
- 762
- Resources
- 193
- Solutions
- 36
- Thanks
- 735
- Location
- Central FL
- Vehicle(s)
- '72 CJ5, 401, T18, D20, D44, D30
'82 CJ8, 258, D300, AMC20, D30
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Manic Mechanic
Full Time Jeeper
- Posts
- 1,880
- Media
- 34
- Solutions
- 10
- Thanks
- 499
- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
Snip the wire it just attaches to a probe. There's no antifreeze in there just an inert gas to operate the gauge
Or if you want to reuse the gauge clamp the heater hose on both ends of the manifold then you will only lose what tiny bit is in the manifold
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