Hamilton Jet HJ212 Installation And Service Manual page 46

Installation
Mount the flywheel adapter plate onto the flywheel and check that the bore is running true to within 0.1

TIR. Tighten the securing bolts to the approved torque. Refer to drawing: HJ21202002 Flywheel Adaptor.
Mount the Centa coupling on to the flywheel adapter plate and tighten the bolts to the recommended

torque.
Refit the bellhousing back onto the engine and tighten up the bolts to the recommended torque.

Loosely attach the front engine mounts into the engine at their lowest adjustment height.

The front engine mounts must be of a stiff fully enclosed type allowing minimal fore and aft and
sideways deflection. The maximum permitted deflection due to the engine weight (applied
either vertically or sideways) is 1.3mm. If the mount type does not prevent lifting, a bracket
should be made to fit over the top of the mount. This should limit the upward movement to a
maximum of 3mm.
Fit the engine into the vessel, sliding the Centa coupling [1] on to the jet units' splined mainshaft and

support the weight of the engine.
Slide the bellhousing up to to the engine mount adapter [2] and align the securing holes in the adaptor

with the bellhousing.
Fit bolts [9], flat washers [10] and spring washers [11] and tighten to the recommended torque before

releasing the weight of the engine.
These bolts are tightened before releasing the weight of the engine because the Centa
coupling and the jet mainshaft are not designed to take the weight of the engine.
Temporarily support the front of the engine on blocks with the engine and jet unit in line (see item 13

below). Ensure that the engine bed is parallel to the base of the engine mount bracket and that the
mounts will be in the middle of their adjustment range. Modify the bed as required to achieve this.
Check that the bellhousing, flywheel, ring gear and engine sump all clear the jet intake with sufficient

allowance for movement during operation.
Adjust the horizontal and vertical position of the front engine mounts until the gap between the bearing

housing flange and adaptor [2] is equal at all points around the flange. The maximum permitted
difference between the largest and the smallest gap is 0.25mm.Refer to drawing: HJ21202005 Close
Coupling Kit.
Mark the position of the mounts and fixing holes on the engine bed. Remove the engine (if necessary)

before drilling the holes.
Refit the engine and bolt the mounts to the bed ensuring that correct engine alignment is maintained.

Complete the installation of the engine.
The engine alignment must be checked again after the engine mounts have settled and with
the vessel in the water. The life of the coupling will be greatly reduced if the alignment is not
correct.
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Installation and Service Manual