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Author Topic: Clutch Master Cylinders  (Read 3542 times)

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Offline captspillane

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Clutch Master Cylinders
« on: December 04, 2014, 06:04:48 PM »
Hello, I am currently running my Iron Duke Kammback with the clutch master cylinder from a 258 Eagle. Scanning through Rockauto, it seems like that site believes that a stock Iron Duke master cylinder would be 3/4" or 13/16" bore while the 258 had a 11/16" bore. A larger bore on the master cylinder would decrease the pedal movement necessary and my Kammback does shift a little closer to the floor than I'd prefer, although it certainly works fine as is.

My 151 Eagle is currently using the entire clutch system from a 258 Eagle except for the pushrod. The pushrod from the old Iron Duke slave pulled right out of the rubber boot and right into the rubber boot of the new 258 slave. The difference in length between the pushrods is the only difference I could see.

Can anyone here confirm or deny from a reliable source what the clutch master cylinder bore size should be for these options? All of these should be nearly identical.

1) 1980 151 Iron Duke Spirit
2) 1981 151 Iron Duke Eagle
3) 1982 258 Eagle
4) Late 1983 150 AMC 4 cyl Eagle
Currently Inspected and Insured as of Jan 2013:
-1985 Eagle Station Wagon 258 T5 Stickshift
-1980 Eagle Station Wagon 258 Auto Fuel-injected with GM TBI

Minor Repairs Underway:
-1982 Eagle SX4 258 T5
-1981 Kammback 2.5L Iron Duke T5

Restoration Efforts Near Completion:
-1982 SX4- 401 NV3550
-1983 SX4- 4.5 MPI NSG370 (6 Speed)

Restoration Efforts Underway:
-1985 SW- 4.0 MPI AX15
-1982 SX4- 4.0 AW4
-1981 SX4- SD33T NV4500 (Turbodiesel 5 speed)

Future Rescue Efforts- '85 Maroon SW, '87 Limited SW, '84 Limited SW, '87 4 door Sedan, '81 2 door Sedan, '88 White SW, '77 4 door Hornet, '74 2 door Hornet, '79 Spirit AMX, '81 Kammback.

RIP- Red '81 SX4, '84 4dr Sedan, '84 SW, '81 SW, '80 Spirit, '83 SW, '83 4dr Sedan

Offline AMC of Houston

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Re: Clutch Master Cylinders
« Reply #1 on: December 04, 2014, 08:53:58 PM »
I'm afraid the AMC parts books don't specify the size (bummer); but if the part numbers will help ID the diameter thru a cross-ref somewhere, here they are:

1) 1980 151 Iron Duke Spirit -- 5359822 or 3236757 (mid-year change)
2) 1981 151 Iron Duke Eagle -- 3236757
3) 1982 258 Eagle -- 3238493
4) Late 1983 150 AMC 4 cyl Eagle -- 3238493

Of course add a "J" to these for the Chrysler version.

Good luck.
George G.
'81 Eagle Sundancer
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