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Polyurethane Engine Mount for Cars, Vans and Trucks by PolyPro

Polyurethane Engine Mount for Cars, Vans and Trucks

An engine mount is the flexible support through which the powertrain is attached to the body or subframe: it carries the weight of the motor, holds it in its designed position and damps vibration. The same part is also called a motor mount or an engine cushion. PolyPro casts it from polyurethane in its own moulds, for passenger cars, commercial vehicles and special machinery. The rest of the suspension and driveline range is in the catalogue.

 

What an Engine Mount Is and How It Works

An engine mount consists of a metal sleeve or bracket and a flexible element between them. The flexible section deforms under the weight of the motor and under torque reaction, absorbing the energy of the oscillation and keeping it from reaching the shell. Some mounts work mainly in compression and others in shear and torsion, which is why their construction differs even within a single vehicle.

In a transverse layout one mount takes the main weight of the assembly, a second balances it, and the lower torque rod controls the rocking that comes with acceleration and braking. Together with the gearbox mount they form one system: when a single part sags, the rest start working at an angle. For that reason the condition of every mounting point is assessed together rather than one at a time.

 

Signs of a Worn Engine Mount

A worn engine mount first shows itself as vibration at idle that carries into the steering wheel, the gear lever and the floor. A dull knock follows: the assembly manages to shift before the mount stops it.

  • vibration at idle, felt through the steering wheel and gear lever
  • a dull knock when pulling away, braking or changing gear
  • the assembly lurching when the throttle is snapped open or released
  • cracks, tears or a permanent set in the flexible section
  • the polyurethane or rubber separating from the sleeve or bracket
  • the motor sitting low: misaligned pulleys, stretched hoses and wiring

Check the mount with the vehicle raised: prise it with a bar to feel the play, then have someone load the engine briefly in gear — movement of a few millimetres means the flexible element has given up. Inspect the bracket and the stud thread as well, since metal often cracks after a mount collapses.

 

Polyurethane or Rubber in an Engine Mount

A factory engine mount is made from a rubber compound: it is soft and isolates high-frequency vibration well, but it ages from heat, oil, fuel and ozone, and after a few years it takes a permanent set and sags. Polyurethane is denser, barely reacts to oil and fuel, copes better with temperature swings and keeps the height of the mounting point through its whole service life.

In practice a polyurethane mount locates the assembly more firmly: less movement under acceleration, cleaner gear changes, less load on the driveshafts and hoses. The downside is that a little more vibration reaches the shell, which is more noticeable on a passenger car than on a truck or on machinery. That is balanced by the choice of durometer: the Shore value is listed on each product page.

 

How to Choose an Engine Mount

Engine mounts are selected by mounting position, fitting dimensions and design, not by the name of the model. Below are four parameters worth checking before ordering, so the part fits without any reworking.

By Mounting Position

Work out which mounting point has failed: the upper mount that carries the weight of the assembly, the side mount that balances it, or the lower torque rod that holds the motor against rocking. Each has its own shape and its own load pattern, so they are never interchangeable. The gearbox mount stands apart and is often confused with the engine one, although it works mainly in shear and takes the jolts of gear changes. If the vibration is still there after the engine mount has been replaced, check the gearbox mounting. On a lift the difference shows in the play: the engine mount moves vertically, the gearbox mount lengthways.

By Fitting Dimensions

Remove the old mount and measure it: overall body size or outer sleeve diameter, height of the flexible section, stud diameter and length, centre-to-centre hole spacing and the inner bush bore. Compare that with the product page, because parts that look identical often differ in height by a few millimetres and the assembly ends up sitting at an angle. If the old part has broken up, work from the bracket and the seat, and for rare machinery order a part made to a drawing, a sample or a worn item, from one piece up. Check left and right mounts separately, as they are not always mirror images.

By Durometer

Durometer is chosen for the load, not on the principle that harder is always better. A car used daily in town takes a softer polyurethane: it stays closer to the factory feel and adds no vibration at idle. A truck, a bus, special machinery, regular towing or an engine with higher torque needs a denser material, otherwise the assembly shifts under drive and loads the driveshafts. The Shore value is listed on each product page, and it is better to keep the same grade across every mounting point. On vehicles that regularly pull away loaded or tow a trailer, a soft grade takes a permanent set quickly.

By Design

Mounts differ in construction: a solid polyurethane insert in a metal housing, a mount with a stud, a mount with an inner bush for a through bolt, or a torque rod with two eyes. The factory part may be hydraulic, with a fluid chamber inside; the polyurethane equivalent has no such chamber and works as a plain flexible element, so it damps vibration in a different way. Before ordering, check the fixing type — stud, through bolt or pressed-in bush — because that decides whether the part will go into the standard seat. The photographs and dimensions on the product page show the housing geometry and the seat type.

Why an Engine Mount Is Bought from PolyPro — Retail and Wholesale

PolyPro is the manufacturer: its own moulds, its own casting shop, dimensional control on site and sales without intermediaries. Because of that an engine mount comes without a chain of mark-ups, and its geometry follows the drawing from batch to batch. The products carry a warranty. Retail is by the piece — a single mount can be ordered for one mounting point instead of a set. Non-standard parts are made to a drawing, a sample or a worn item, also from one piece up.

Wholesale is intended for workshops, parts shops, fleets and resellers. The partner programme gives bonuses on turnover or on the size of a single order, access to prices and stock levels, and shipment under the partner's own brand. International shipping is available.

 

Frequently Asked Questions

What is the difference between an engine mount and a motor mount? 

They are the same part under two names: engine mount is the catalogue term, while motor mount and engine cushion are the workshop ones. The wider group, which also includes gearbox mounts, differential mounts and damper pulleys, is gathered in the engine and transmission mounts section.

How many mounts does an engine have? 

It depends on the layout. On most front-wheel-drive cars there are three or four points for the engine and gearbox together: an upper mount, a side mount and a lower torque rod. Trucks and special machinery use more points. Check the mounting diagram for the specific assembly.

Can just one mount be replaced? 

Yes, but a new mount sitting next to worn ones takes the larger share of the load and gives up sooner. If the mileage is the same at every point, replacing the set is more sensible: the assembly sits square, the angle is gone and vibration does not move from one mount to the next.

Will polyurethane work in place of a hydraulic mount? 

A polyurethane mount has no fluid chamber, so it works as a plain flexible element: it locates the motor more precisely and cannot leak, but it damps high-frequency vibration differently. On commercial vehicles and in hard service the swap is justified; on a passenger car a softer grade is chosen instead.

How can an engine mount be checked at home? 

Put the vehicle on the handbrake, select a gear and briefly raise the revs while watching the motor. Visible shifting or jumping of the assembly, a knock, or parts touching the body mean the flexible element has failed. Also inspect the mount for cracks and for separation from the sleeve.

Which durometer suits a town car? 

For daily driving in town the softer option is the usual choice: it stays closer to the factory level of comfort and adds no vibration at idle. For goods vehicles, towing and engines with higher torque a denser grade is used. The Shore value is listed on each product page.

Is it possible to buy a single engine mount at retail? 

Yes, retail is by the piece, so one mount can be ordered for a single mounting point without buying a kit. If the item is not in stock, PolyPro makes it to a drawing, a sample or a worn part, also from one piece up. The products carry a warranty and international shipping is available.

What are the wholesale terms? 

Wholesale is available to workshops, parts shops, fleets and resellers. The partner programme gives bonuses on turnover or on the size of a single order, access to prices and stock levels, and shipment under the partner's own brand. Terms are agreed individually.