Author Topic: Checking valve stem length on Cadillac 346  (Read 157 times)

Offline z3skybolt

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      CLC Member #30482
  • Name: Robert L. Ritchie
Checking valve stem length on Cadillac 346
« on: November 04, 2017, 01:10:03 PM »
The shop manual specifies a Tool #J-105 for checking the valve stem length when installing new valves and lifters. It also describes a procedure for establishing proper length by measuring the clearance between the valve stem and top of plunger as being between .030 and.070 of an inch: with no oil in the hydraulic unit and with the plunger and spring fully depressed.

If tool J-105 is not available is there another acceptable way or tool that can be used to accomplish the same determination? Can one make a tool or just use the measurement between the valve stem and plunger as an alternate method?

Is is reasonable to change the lifers with the engine in the car? My car is a 1940 LaSalle.

Last of all...anyone have the tool J-105 that they would rent for a couple of weeks? I'd be glad to make a security deposit and pay a fair rental fee.

I live in Missouri.

Thanks,

bob
« Last Edit: November 04, 2017, 01:12:29 PM by z3skybolt »
1937 Buick Special Coupe( owned for 46 yrs.))
1940 LaSalle 5227 Coupe(bought in May 2016)
1974 VW Beetle bought ( in 2000)
1985 Lincoln Town Car Signature Series( bought new)
2000 BMW Z-3(bought new)
Newer cars that don't matter.

Offline Bobby B

  • Posts: 1596
  • Mendham, New Jersey
  • Name: Bob Bender
Re: Checking valve stem length on Cadillac 346
« Reply #1 on: November 04, 2017, 10:08:22 PM »
Bob,
  Hi. Your valves have to be set up with exactly 3" of space between the stem tip and the heel of your cam lobe and you should be good to go. I think the tool is nothing but a 3" spacer. Use a 3" micrometer standard for double checking if need be. If you're asking questions about this now, it's a little late. If your machinist didn't do this as part of the valve job, the engine's basically going to have to come apart again. If you suspect the lifters being bad, they should actually be tested individually, out of the engine. The .030-.070 is basically your range for valve seat/tip wear. Please tell me that this isn't the engine you sent me a video of that took forever to build...... If it is, what happened?  ???
                                                                                                                                                                                                                          Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Offline z3skybolt

  • Posts: 88
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  • Name: Robert L. Ritchie
Re: Checking valve stem length on Cadillac 346
« Reply #2 on: November 04, 2017, 11:52:03 PM »
Bobby,

I sent you a private message.

bob
1937 Buick Special Coupe( owned for 46 yrs.))
1940 LaSalle 5227 Coupe(bought in May 2016)
1974 VW Beetle bought ( in 2000)
1985 Lincoln Town Car Signature Series( bought new)
2000 BMW Z-3(bought new)
Newer cars that don't matter.

Offline Steve Passmore

  • Posts: 4925
  • Name: Steve Passmore
Re: Checking valve stem length on Cadillac 346
« Reply #3 on: November 05, 2017, 01:50:12 AM »
I made a tool myself Bob by cutting the head off an old valve, machining it to exactly 3" and welding a 12" steel rod to it in it' centre making a long 'T' handle basically. Easy.
Steve

Offline z3skybolt

  • Posts: 88
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      CLC Member #30482
  • Name: Robert L. Ritchie
Re: Checking valve stem length on Cadillac 346
« Reply #4 on: November 05, 2017, 05:52:58 AM »
Thanks Steve,

From the picture in the manual it looked to be simple.  Will do something similar.

Bob
1937 Buick Special Coupe( owned for 46 yrs.))
1940 LaSalle 5227 Coupe(bought in May 2016)
1974 VW Beetle bought ( in 2000)
1985 Lincoln Town Car Signature Series( bought new)
2000 BMW Z-3(bought new)
Newer cars that don't matter.

Online Barry M Wheeler #2189

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  • Name: Barry Wheeler
Re: Checking valve stem length on Cadillac 346
« Reply #5 on: November 05, 2017, 11:47:07 AM »
This tool was commonly known among mechanics as "The Three Inch Tool."
Barry M. Wheeler #2189

1979 Cadillac Fleetwood Brougham
1981 Cadillac Seville
1991 Cadillac Seville
2016 Cadillac ATS

Offline Bobby B

  • Posts: 1596
  • Mendham, New Jersey
  • Name: Bob Bender
Re: Checking valve stem length on Cadillac 346
« Reply #6 on: November 05, 2017, 03:54:29 PM »
This tool was commonly known among mechanics as "The Three Inch Tool."

 ;D ;D ;D
           Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH