Engine Bushing Basics

In technical terms, a "bushing" is a flexible isolator designed to absorb vibration, but it generally means something a bit different when you're talking about engines. In an engine, a bushing is indeed an isolator, but in this case it's more of a metal sleeve designed to keep moving components from wearing directly on other components. In this sense, the bushing actually functions more as a bearing. The difference is a subtle one, but bearings are typically used for components -- like the camshaft and crankshaft -- that constantly rotate, while bushings are used for reciprocating movements.

Materials

Another thing that separates bushings from bearings is that the bushing itself often acts as a sort of metal lubricant for the engine. As such, bushings need to be made of metals like bronze, which is almost as metallurgically "slippery" as copper, but is hard enough to withstand the rigors of an internal combustion engine. While most bushings use a standard bronze composed of copper and tin, copper-nickel alloys offer a bit more corrosion resistance with little to nothing given up in terms of strength and lubricity. This contrasts sharply with bearings, which often use a softer aluminum alloy that requires constant and heavy lubrication.

Common Locations

Because bushings are typically used for reciprocating -- back-and-forth -- movement, you'll find them most often in the valvetrain. You'll almost always find the pressed into the lifter bores of "pushrod" engines, keeping the lifters out of direct contact with the engine block. Valves need high-lubricity sleeves to keep them from binding in the cylinder head, because valves only get what lubricant sticks to them after they pass through the valve seals. You'll often find bushings pressed into the wristpin holes on pistons, allowing the pin to rotate or "float" in the pin bore.

Exterior Bushings

Your engine's motor mounts are bushings in the standard sense of the word, in that they serve to isolate engine vibrations and keep them from snaking through the chassis and rattling your fillings out. Motor mounts typically consist of a pair of metal plates bonded together with rubber; holes cast into the rubber give it a bit more room to contract and expand. While they do a good job of isolating vibrations when new, rubber mounts will wear out over time, the rubber softening and tearing with constant heating and cooling cycles.

Harmonic Balancers

Believe it or not, your engine's harmonic balancer is, in fact, one kind of bushing. Harmonic balancers are functionally similar to motor mounts. They consist of a metal hub mounted to the nose of the crankshaft, a thick ring of rubber around the center hub and a heavy iron ring bound to the outer edge of the rubber ring. As minor vibrations work down your pistons and try to shake the crankshaft, the balancer cancels them out using the inertia of that heavy outer ring to resist rapid acceleration and deceleration of the crank. In this sense, the balancer stabilizes the crankshaft, keeping from reaching a point of harmonic resonance and snapping in two because of minor vibrations in the rotating assembly.

Shiyan Renman Automobile Parts Co., Ltd. was established in Shiyan city, so called automobile city in China, in 2008.  We mainly supply diesel  engines and spare parts for various trucks, buses, pickup, SUV, MPV, VAN,  marine, construction machinery, such as A2300, ISF2.8/3.8, 4BT3.9, 6BT5.9, 6CT8.3, 6L8.9, QSB6.7, ISBe, ISDe, ISLe, ISM, QSC, QSL, QSM, M11, L10, N14, NT855, KTA19/38/50.

Q:Are you a manufacturer?

A: No, we are an engine parts trading compnay, a distributor of some manufacturers.

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A:To get an accurate quotation, please let us know the exact part name, quantity, quality level and trade terms like EXW, FOB and so on.  More details provided will help.

Q:How many days will samples be finished? And how about mass production?

A: For regular models, generally we have ready samples to be sent out at the earliest time.

As for mass production, it completely depends on customers’ order quantity.

Q:Do you inspect the finished products?

A: Yes,we must make sure the goods are 100% new and quality is 100% qualified.

Q:How do you ship the finished products?

A: By sea or by air, completely based on customers’ request and order quantity. 

Why choose us?

1.Various&Flexible supply ability
We have built solid relationships with numbers of strong manufacturers, such as Dongfeng Engine, Wuxi Holset Turbo, Bosch China, etc. So we can provide a various range of auto parts.

2.High quality and competitive price
Genuine parts are with very high quality, the quality of high copy parts are good enough, and common quality for common copy parts.
For high copy parts, it's really cost effective.

3.Quality assured
Generally the parts are tested before shipment, the quality can be assured unless problems happen during transportation.

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