This Seloc repair manual covers all 1962-1984 Chrysler Outboard motors, 3.5-150 HP, 1-4 cylinder, 2-stroke models.
Step-by-step illustrated keyed procedures guide you through every conceivable job possible, including all adjustments necessary. Perfect for do-it-yourselfers, professional mechanics, or students.
Book Excerpt: 1962-1984 Chrysler 3.5-150 HP Outboard Motor Repair Manual
MAINTENANCE AND TUNE-UP
Seloc estimates that 75% of engine repair work can be directly or indirectly attributed to lack of proper care for the engine. This is especially true of care during the off-season period. There is no way on this green earth for a mechanical engine, particularly an outboard motor, to be left sitting idle for an extended period of time, say for six months, and then be ready for instant satisfactory service.
Imagine, if you will, leaving your car or truck for six months, and then expecting to turn the key, having it roar to life, and being able to drive off in the same manner as a daily occurrence.
Therefore it is critical for an outboard engine to either be run (as least once a month), preferably, in the water and properly maintained between uses or for it to be specifically prepared for storage and serviced again immediately before the start of the season.
Only through a regular maintenance program can the owner expect to receive long life and satisfactory performance at minimum cost.
INTAKE MANIFOLD AND REED BLOCK ASSEMBLY
(See Figures 29 thru 33)
The reed valves are located between the carburetor and the crank case. One set of reeds is used per cylinder.
The reed arrangement operates in much the same manner as the reed in a saxophone or other wind instrument. The piston creates vacuum and pressure in the crank case as it moves up and down in the cylinder. As the piston moves upward, a vacuum is created in the crank case. This vacuum "lifts" the reed off its seat, allowing fuel to pass.
On the compression stroke, when the piston moves downward, pressure is created and the reed is forced to the closed position.
A wide range of reed boxes may be found on an outboard unit, due to the varying designs of the powerheads. All installations employ the same principle and there is no difference in their operation.
A broken reed is usually caused by metal fatigue over a long period of time. The failure may also be due to the reed flexing too far because the reed stop has not been adjusted properly or the stop has become distorted.
If the reed is broken, the loose piece MUST be located and removed, before the powerhead is returned to service. The piece of reed may have found its way into the crank case, into the passage leading to the cylinder, or in the cylinder.
If the broken piece cannot be easily located, the powerhead must be completely disassembled until it is located and removed.
An excellent check for a broken reed on an operating powerhead is to hold an ordinary business card approximately 2 in. (9cm) in front of the carburetor. Under normal operating conditions, a very small amount of fine mist will be noticeable, but if fuel begins to appear rapidly on the card form the carburetor, one of the reeds is broken and causing back flow through the carburetor and onto the card.
A broken reed will cause the engine to operate roughly and with a "pop" back through the carburetor.
Subject: 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984 Chrysler Outboards 3.5-150 HP, 1-4 Cylinder, 2-Stroke Models service, maintenance, repair. ISBN-10: 0893300187 | ISBN-13: 9780893300180 | Seloc 1000