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Knocking when turning left
Indystone - 19/5/24 at 07:48 PM

I bought an mk Indy a few weeks ago.

It’s started to develop a knock when turning hard (ish) to the left.

What could this be?

Noise is coming from the back, don’t have much experience working on cars (done quite a bit with motorbikes), checked drive shafts for play and both sides have the same amount (don’t have anything to compare them to). Near side bolts where drive shaft connects to diff were loose, but have now re tightened them.

Really appreciate any help.

Matt

jacko - 19/5/24 at 08:11 PM

Rear hub nut coming loose jack the rear up and give it all a good check
It could be top suspension nuts coming loose at the outer end
I renewed mine with lock nuts and fitted a split pin
Graham

[Edited on 19/5/24 by jacko]

Indystone - 19/5/24 at 08:20 PM

Thanks, I’ll try and have a look tomorrow

falcor75 - 20/5/24 at 05:30 AM

If its not whats mentioned above I would say wheel bearing or CV joint as the main culprits.

nick205 - 20/5/24 at 10:16 AM

quote:
Originally posted by jacko
Rear hub nut coming loose jack the rear up and give it all a good check
It could be top suspension nuts coming loose at the outer end
I renewed mine with lock nuts and fitted a split pin
Graham

[Edited on 19/5/24 by jacko]



Many MK Indy's use Ford Sierra differentials, driveshafts, wheel bearings at the rear.

1. The rear hub nuts are very very tight. The nuts on mine had sections youe staked intoa groove on the driveshaft to prevent them coming loose.

2. If you remove a rear hub nut of this type I think it's best practice to replace it with a new one.

3. One side of the car the hub nut is right hand thread, the other side is left hand thread (important when trying to tighten or undo).

ReMan - 20/5/24 at 10:48 AM

Could be a million things.

If you push the car with it hard left does it do it?
Hubs and wheel bearing are pretty robust but jack up and check?
The hub carriers have been know to fail/crack
Suspension joints/buskes siezed up, common
The big diff mount plates have been known to fail on these

Start looking and get back :-)

coyoteboy - 20/5/24 at 11:20 AM

Does it knock once or repeatedly?
Does it only knock when heavy cornering and not light?
What diff/axle config do you have?

jacko - 20/5/24 at 02:46 PM

He says a Indy it will or should have a sierra rear end .
Unless he has a mk locost then it may have a solid axel
Graham

coyoteboy - 21/5/24 at 01:38 PM

quote:
Originally posted by jacko
He says a Indy it will or should have a sierra rear end .
Unless he has a mk locost then it may have a solid axel
Graham


I like to ask stupid questions, in order to not make assumptions

rusty nuts - 21/5/24 at 01:50 PM

Knocking could be any number of things, I would start by checking all suspension components and fittings , diff security, prop shaft clearance to chassis, gearbox mount(could be allowing prop to hit chassis, it was a common problem with the standard type 9 mount ) Check for witness marks where contact is likely

Stot - 23/5/24 at 02:15 PM

Rusty Nuts just reminded me, but I built a Sylva Jester way back when and had a knock I couldn't find on hard cornering left I think it was. Spent ages trying to track it down and then noticed some wear on one of the chassis members.

Under hard turning the engine was moving over enough on its mounting rubbers that the vibration of the engine was making the thermostat housing on the xflow tap against the chassis. It was a very tight fit for the 1700 engine.

Cheers
Stot

jacko - 28/5/24 at 12:10 PM

Description
Description

This is how I stopped my engine from tapping on the prop tunnel
G