|
Tune-Up Specifications - John Deere |
This data has been gathered from old out-of-print material. While
we make every effort to be accurate, the information shown is to
be used for general reference only. It is always best to have
the original service or operator's manual for your tractor before
attempting any tuneup.
There is a legend at the bottom of the page describing some of the terms used here.
|
Model
|
Point Gap
|
Spark Plug Gap
|
Timing Mark On
|
Spark Occurs
|
Firing Order
|
Int. Valve Clearance
|
Exh. Valve Clearance
|
Comments
|
|
M,MT |
.020 |
.025 |
FLY |
TDC |
1-2 |
.012C |
.012C |
For magneto set point gap to .015 |
|
L,LA |
.020 |
.025 |
FLY |
TDC |
1-2 |
.006H |
.008H |
For magneto set point gap to .015 |
|
H (All Fuel) |
.015 |
.030 |
FLY |
|
1-2 |
.015H |
.015H |
Spark occurs when dot or "LH-Impluse" aligns with index on cover or case. |
|
G (All Fuel) |
.021 |
.030 |
FLY |
|
1-2 |
.020H |
.020H |
For magneto set point gap to .015 - Spark occurs when dot or "LH-Impulse" aligns with index on cover or case. |
|
D (All Fuel) |
.015 |
.030 |
FLY |
|
1-2 |
.030H |
.030H |
Spark occurs when dot or "LH-Impluse" aligns with index on cover or case. |
|
B (All Fuel & Gas) |
.015 |
.030 |
FLY |
|
1-2 |
.020H |
.020H |
Spark occurs when dot or "LH-Impluse" aligns with index on cover or case. |
|
A (All Fuel & Gas) |
.021 |
.030 |
FLY |
|
1-2 |
.020H |
.020H |
For magneto set point gap to .015 - Spark occurs when dot or "LH-Impulse" aligns with index on cover or case. |
|
80 Cranking Engine |
.020 |
.025 |
FLY |
30 deg. BTDC |
1-2-3-4 |
|
|
|
|
70 Cranking Engine |
.020 |
.025 |
FLY |
30 deg. BTDC |
1-2-3-4 |
.020H |
.020H |
|
|
70 (LP), 60 (LP) |
.022 |
.030 |
FLY |
5 deg ATDC |
1-2 |
.020H |
.020H |
|
|
70 (Gas) |
.022 |
.030 |
FLY |
10 deg. ATDC |
1-2 |
.020H |
.020H |
|
|
70 (All Fuel), 60 (All Fuel) |
.022 |
.030 |
FLY |
TDC |
1-2 |
.020H |
.020H |
|
|
50 & 60 (LP & Gas) |
.022 |
.030 |
FLY |
5 deg ATDC |
1-2 |
.020H |
.020H |
|
|
50 (All Fuel) |
.022 |
.030 |
FLY |
TDC |
1-2 |
.020H |
.020H |
For point gap, for LP set TDC. |
|
40 (All Fuel) |
.022 |
.025 |
FLY |
3 deg ATDC |
1-2 |
.012C |
.012C |
For point gap, for LP set TDC. |
| Legend |
|---|
- TDC - Top Dead Center
- FP - Crankshaft Fan Drive Pulley
- Exh - Exhaust
- Int - Intake
- ATDC - After Top Dead Center
- BTDC - Before Top Dead Center
|
|
Data collected from an old Niehoff tune-up chart.
|
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