Bronze Spigot Bush

Includes clutch, transmission, propeller shaft,
universal joints, differential and rear axle.

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smclaren
Posts: 54
Joined: Wed Feb 22, 2006 11:07 pm
State: QLD
Location: Sunshine Coast

Bronze Spigot Bush

Post by smclaren »

Hey Guys
So I am dealing with a gearbox/clutch noise that I am suspecting is the bronze spigot bush.
Has anyone dealt with a noisy spigot bush before ?
What sort of noise did it make ... and under what conditions (clutch/gear selection movements etc) was it misbehaving ?
Cheers, Steve
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Blacky
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Joined: Tue Jul 20, 2004 8:58 am
State: WA
Location: up in the Perth hills

Re: Bronze Spigot Bush

Post by Blacky »

Never had an issue but quite often you see a discussion about these and people say put a smear of grease in them when you install a gearbox - from what I have been told that is incorrect you should only put oil on them as the material is porous and the grease will it and it will run dry
I started with nothing and still have most of it left.


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ardiesse
Posts: 1211
Joined: Thu Jan 19, 2017 9:57 am
State: NSW
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Re: Bronze Spigot Bush

Post by ardiesse »

Steve,

As Blacky says. Leave the bush in engine oil for a day before installation. Don't use grease.

Spigot bushes almost never give trouble. And the sintered bronze bushes are quiet in operation. So tell us what the clutch/gearbox noise is, and we'll do our best to diagnose it. Apart from the engineered-in "nacka-nacka" sound of clutch shudder -

Example 1: A weird whirring, almost howling sound just as the clutch begins to engage. If the driven plate splines have excess clearance on the gearbox input shaft, the clutch plate can wobble, and it chatters between the flywheel and pressure plate faces. Clutch replacement's the only option here, hopefully with a more closely toleranced driven plate hub.

Example 2: A brief, high-pitched "eeek" just as you begin to push down on the clutch pedal. This is the throwout bearing contacting the diaphragm spring fingers. It's too much work to drop the gearbox just to put grease on the fingers, so live with it.

Example 3: A whirring sound when the clutch is disengaged. Throwout bearing troubles.

Example 4: A gentle "shhhh" sound in neutral. Indicates gearbox bearing troubles: input shaft ball bearing, cluster gear needle roller bearings.

Example 5: A low-pitched whirring sound when accelerating through 30 mph in top gear. Gearbox mainshaft bearing noisy.

Does the noise happen when the engine's stopped? In this case it's to do with the slave cylinder, clutch fork, or (very occasionally) the pressure plate diaphragm spring pivots.

Rob
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