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Q: Are the standard
engine
mounts supplied
with my engine configured to my particular installation?
A: NO, in our experience
engine
mounts
supplied with your engine are generic i.e. they are supplied with a
particular model engine however the gearbox reduction can differ
which results in different thrust figures which in turn results in
varying amounts of axial movement. The same engine can also be
fitted into a variety of different craft that have different
requirements and working conditions.
Q:
How important is axial movement?
A:
For most installations that have down angle, drop centre or vee
drive gearboxes we only want the engine axial movement to be 3mm
maximum. Working within this tolerance will ensure that the true
shaft half coupling alignment to the gearbox output flange will be
maintained under maximum applied thrust. This reduces vibration and
wear on
shaft
seals and bearings.
Q:
Are Isoflex
engine
mounts generic?
A:
NO, Isoflex
engine
mounts are supplied on a custom basis i.e. the gearbox
configuration being either in line, down angle, drop centre or vee
drive, placement of the mounts, support of the bell housing, the
applied thrust and working conditions are taken into account.
Q:
Are all engines four point mounted?
A:
NO,
applied power and configuration may require four, five, six, or
eight point mounting to achieve the required axial movement while
still reducing the engine vibration levels throughout the rpm range.
We prefer six point mounting with down angle, drop centre, or vee
drive applications.
Q:
What technical information is available that is relative to my
particular installation?
A:
Data
sheets can be supplied that give Axial Load vs Deflection and Thrust
(shear) Load vs Deflection, Attenuation (vibration reduction)
levels. Drawings - .dxf are available.
Q:
What are Isoflex
engine
mount made from?
A: Isoflex
engine
mounts and couplings are manufactured from an engineering
grade heat cured polymer alloy.
Please
note: due to their inherent construction Isoflex
engine
mounts and
flexible shaft
couplings electrically isolate the engine from the engine bed and
drive train.
Q:
How important is the actual installation of Isoflex
engine
mount into the
vessel?
A:
Due
to their static nature the installation
of engine mount
is critical to
its
life
expectancy. Fabricated engine bracketing can be out of
alignment to the engine bed. Soft rubber type
engine
mounts are more
forgiving in this area - the down side is that they allow too much
axial and horizontal deflection. It is IMPERATIVE that the top of
the engine bed is parallel to the base of the engine mounting
bracket in all planes to avoid any pre-load on the Isoflex
engine
mount
base, stud and core material.
Q:
How should we place the engine mounts on the engine and
transmission?
A:
All of the engine mounts used in an installation should be placed on
or as near as possible to the crankshaft centreline. If the
engine
needs to be raised or lowered to the hull, the engine mount to bed
base must be adjusted to obtain the necessary relationship with the
crankshaft centre line.
Q:
Will Isoflex
engine
mounts retain my engine should the vessel be in a 360
deg roll.
A:
YES, the Isoflex mounts are designed to hold your engine in a fully
inverted situation however you must ensure that they are attached to
the engine bed's in such a manner that allows the mount to stay in
place.
Q:
Should I periodically check my engine mounts.
A:
YES, most rubber type
engine
mounts should be checked every six months for
compression and deflection which in turn effects shaft alignment. Isoflex
engine
mounts should be checked every twelve months for uneven
compression of the cores, fastenings to engine beds and fastenings
to engine brackets.
Q:
Are Isoflex mounts fully resistant to diesel, petrol and normal
engine lubricants.
A:
YES, however the studs, nuts and washers are "Silver Zinc Plated"
and over a period of time they may suffer from rust. We recommend
that a waterproof grease or clear spray type protective coating be
applied to the stud, nuts and washers every twelve months. |
