Engine and
transmission mounts are an often overlooked cause of engine noise and
vibration. A loose or broken motor mount that allows excessive engine movement
may allow a belt-driven fan to hit the fan shroud, or the fan to hit the
radiator hoses. Excessive engine movement also can increase the risk of
radiator or heater hose failure, and may even cause the throttle linkage to
bind or stick.
To help
maintain cash flow in the slower winter months, many independent shops replace
worn engines. This also helps squeeze some extra miles from a customer’s older,
but basically sound vehicle. The replacement might be a new original equipment
crate engine, a remanufactured engine, or even a used engine in good condition.
Regardless of the type of engine being installed, it will likely require
inspection and possible replacement of all rubber components including engine
mounts.
Any rubber
engine mount is a wearing or expendable part despite its appearance. While
modern rubber components tend to endure extreme heat much better than older
compounds, engine mounts still fail when exposed to ozone and high under hood
temperatures. Rubber engine mounts will harden in most cases, which increases
the engine noise and vibration transmitted through the chassis to the passenger
compartment.
However,
when repeatedly soaked with hot engine oil, engine mounts will soften and lose
their mechanical strength. Since most powertrain mounts are simply two pieces
of steel laminated together by a tough rubber compound, the mount tends to
separate, which can allow the engine to shift in its cradle. Engine mount
separation can cause “torque-steer” on FWD vehicles when power is applied to
the drive train. In other cases, the engine might simply become dislocated,
causing sticking throttles, clutch chatter, exhaust leaks and other operational
complaints.
Transverse
engines found in FWD applications generally suspend the engine with one large
front mount and two smaller rear mounts located each corner of the engine bell
housing. In some FWD applications, a “dog bone” or torque strut might be bolted
between the engine and the front radiator core support to absorb engine torque.
The
transmission is supported by a rear transmission mount attached to a removable
frame cross member in conventional RWD applications. The same type of mount can
also be located between the transmission and transfer case on four-wheel drive
vehicles. Unfortunately, this type of mount configuration is usually ruined by
hot oil dripping from the transmission or transfer case adapter. Some
applications might also use a small torque strut that helps the rear
transmission mount control engine torque.
Component
accessibility is a major economic issue when repairs are performed in a
commercial setting. A conventional RWD platform provides an excellent example
of why it’s cheaper to replace mounts when the engine is being replaced. One
popular labor guide lists five hours for replacing both front engine mounts.
Removing and replacing the engine requires 16.7 hours of shop time. Obviously,
replacing the mounts in pairs will cost the owner approximately one-third as
much as replacing the complete engine. But, since the engine mounts must be
exchanged from the old engine to the new, replacing with new ones adds only the
cost of the mounts to the repair order. As with any expendable, low-access component,
it’s far less expensive to replace it during a major engine service.
Engine and
transmission mounts are an often overlooked cause of engine noise and
vibration. A loose or broken motor mount that allows excessive engine movement
may allow a belt-driven fan to hit the fan shroud, or the fan to hit the
radiator hoses. Excessive engine movement also can increase the risk of
radiator or heater hose failure, and may even cause the throttle linkage to
bind or stick.So if you are looking to buy veichle engines and engine parts or
looking for engine service visit Allindiayellowpage.com
to get complete information about engines,engine parts and engine repairing and
service centers in your city and near by areas.