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Discussion Starter #1
I have a JD 285 & the previous owner installed a thead chaser insert for the spark plug, now the thread has fallen out & the thread hole is worn too big to repeat rethreading with a plug savor. (the housing is aluminum) Any one have an idea to fix? Thank you in advance
 

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My Orange Jane Deere
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That is a very easy fix. Install a new head. Now see how easy that was. :thThumbsU
 

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The Admin from... Nowhere!
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This would be the cylinder head assembly according to JD's parts catalog.... Cylinder head itself is #19 on the diagram...

1 19M7863 SCREW 4 M6 X 25
2 M76073 BUSHING 4
3 M76071 CASE 1
4 M76072 GASKET 1
5A M76083 RETAINER 2 VALVE (NLA) (ORDER AM119639 OR AM119640)
5B M118845 RETAINER 2 (X) (Y) VALVE (INCLUDES TWO HALVES)
6 M120242 SPRING 2 (X) (Y)
7 M76084 PLATE 2 (X) (Y) SPRING
8 M76090 SEAL 1 (X) (Y)
9 M70227 PIN 2
Cart KEY PART NO. PART NAME QTY SERIAL NO. REMARKS
10 M76070 ENGINE CYLINDER HEAD GASKET 1
11 MIU11988 BOLT 5 (SUB FOR M118772)
12 M76092 NUT 2 (X) (Y)
13 M76091 SCREW 2 (X) (Y)
14 ........ CLIP 2 (ORDER AM109389)
15 ........ SHAFT 1 (ORDER AM109389)
16 ........ ROCKER ARM 2 (ORDER AM109389)
17 M120264 INTAKE VALVE 1 (Y) (SUB M150551)
18 M120241 EXHAUST VALVE 1 (X)
19 M139815 CYLINDER HEAD 1 FILTER SIDE (INCLUDES VALVE GUIDES) (SUB FOR AM105550)
Cart KEY PART NO. PART NAME QTY SERIAL NO. REMARKS
M140540 CYLINDER HEAD 1 STARTER SIDE (INCLUDES VALVE GUIDES) (SUB FOR AM105551)
20 AM109389 ARM KIT 1 SHAFT AND ROCKER ARM
21 M118842 PLATE 2 (X) (Y) VALVE SPRING
.. AM119639 KIT 1 EXHAUST VALVE (INCLUDES PARTS MARKED (X)) (NLA) (SUB COMPONENTS) (SUB FOR AM109392)
.. AM119640 KIT 1 INTAKE VALVE (INCLUDES PARTS MARKED (Y)) (NLA) (SUB COMPONENTS) (SUB FOR AM109393 OR AM118856)
 

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My Orange Jane Deere
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No No No that is not right That is not the head.
 

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10K and Climbin!
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My Orange Jane Deere
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3,358 Posts

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My Orange Jane Deere
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Look for a used one. You got to do what you got to do. :thThumbsU
 

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The PO of my Onan 24hp powered (RED) tractor had pulled the helicoils out of the block of the engine. I thought that would be expensive.:crybaby:

I took it to an engine shop and they said no problem. They welded it up and redrilled/tapped the aluminum block.

6 years later it still runs perfect.
 

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My Orange Jane Deere
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Send me all the info you can about the engine and the head number, pictures what ever in a P M and I will help you look. :thThumbsU
 

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My Orange Jane Deere
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3,358 Posts
The PO of my Onan 24hp powered (RED) tractor had pulled the helicoils out of the block of the engine. I thought that would be expensive.:crybaby:

I took it to an engine shop and they said no problem. They welded it up and redrilled/tapped the aluminum block.

6 years later it still runs perfect.
That would be worth checking into to. :thThumbsU
 

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I had the same problem with a BMW 540. Someone installed a helicoil improperly and the hole was to large for a timesert. A machine shop that I deal with has a kit with a larger insert that is threaded, loctited and pinned. I borrowed it and it worked perfect. I will give him a call and post the name of the kit.
 

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Three of my friends
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There is a product called Keensert that will work,it drills out to a certain size and screws in and locks by driving 4 pins into the threads.We used them in aircraft tooling and they worked better than helicoils.I will look for them and post the information.Here ya go,http://www.newmantools.com/kee.htm,call them and tell them it is a sparkplug
 

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Helicoils should be a last resort for thread repair. Especially spark plug threads. Timeserts are best.
 

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10K and Climbin!
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