INSTALL
AIR VENTS
CONTROLS
COOLANT SYSTEM
ELECTRICAL
ENGINE BEDS
ENGINE MOUNTS
EXHAUST SYSTEM
FRONT PTO
FUEL SYSTEM
HOT WATER CYLINDER
OVERFLOW BOTTLE
OVERVIEW
PANELS
PROPELLER
RAW WATER SYSTEM
SEA TRIAL
The Nav Station...
DISCLAIMER
DISCUSSION FORUM
HOME
INSTALL
OPERATE
QUICKLINKS
SELECT
SERVICE
Yanmar Pleasure Boat Marine Engine Help
Calculate the Front Power Takeoff
The majority of installations only drive a freezer compressor or an extra
alternator. When the alternator is bigger than the one supplied with the engine
or the freezer becomes a fridge, freezer and chiller, check the allowable
takeoff power of the front PTO.
First, you need to know the distance between the front face of the crankshaft
pulley and the center of load of the PTO pulley. Have a look a the drawing
below.
Each individual pulley has a different overhang distance (L), you need to measure it.
Caution: Some high performance engines
only allow a single ' V ' belt.
( 4JH3-TE/HTE/DTE, 6LP-UTE/STE (P), 6LY2-STE )
Don't exceed the load limits!
|
To work out the allowable takeoff horsepower (A type only), e.g. from the 2GM20 graph below, where the graphed horsepower (ghp) is 6hp at 3600rpm. USE THE FORMULA: where L = 25mm M = 91, and N = 66 then If we used a pulley with the max distance 'L' of 60mm, the allowable takeoff
horsepower will be: CAUTION: the factors L, M, N and ghp are different between engine models, carefully check the applicable graph! |
Yanmar Front PTO graphs.
| 2GM20 | 4JH2E | 6LP-UTE/STE (P) |
| 3GM30 | 4JH2-TE | 6LY-UTE / STE (P) |
| 3JH2E / TE | 4JH2-H/D/UTE | 6LY2-STE (P) |
| 4JH3-TE / HTE / DTE | 6CX-ETE | |
| 4LH-TE | ||
| 4LH-H / D / STE (P) |
