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Massey Harris & Massey Ferguson Tractors Discussion Forum

135 3cyl Perkins spark plugs

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09-06-2019 19:16:35

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Looking at tune up kits on this site for 135 gas. It list three diff sizes of plugs why is this? Have a 69/70 acourding to SN # it talks about REACH as in 3/4 7/16 and so on. Why is this.

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09-08-2019 12:35:06

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 Re: 135 3cyl Perkins spark plugs in reply to budaa, 09-06-2019 19:16:35  
The serial number you need to find is on side of the engine block just below where the head gasket is. The tractor serial number is a 1973 year model

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09-07-2019 23:49:26

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 Re: 135 3cyl Perkins spark plugs in reply to budaa, 09-06-2019 19:16:35  
Per the MF shop manual for the Perkins AG3.152.
Engines Serial No. 152 UA 15061A and up have a different cylinder head which requires a new longer reach spark plug. The new plug installed in production engines is Champion UN-12Y and is a 14 mm, 3/4" reach type plug. THIS NEW PLUG MUST NOT BE INSTALLED IN ENGINE PRIOR TO SERIAL NO. 152 UA 15061A.

On the UN-12Y it has a 14 mm thread diameter with a 19 mm thread reach (19 mm is almost 3/4 of a inch long).

The earlier plug Champion UJ-8 it has a 14 mm thread diameter with a 9.5 mm thread reach (9.5 mm is almost 3/8 of an inch).

Even with the engine serial number I would recommend looking into the spark plug hole, or take a pick to feel to see how deep the threads are in the head (someone could have swapped cylinder head unless you know if its the original cylinder head).

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09-08-2019 10:54:24

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 Re: 135 3cyl Perkins spark plugs in reply to ptfarmer, 09-07-2019 23:49:26  
SN is Ai7546i

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09-07-2019 05:21:04

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 Re: 135 3cyl Perkins spark plugs in reply to budaa, 09-06-2019 19:16:35  
If I recall plug thread length depends on which head is used..

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