MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey Car Information.

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGF Technical - Sqeak from Engine Bay

The squeak is momentary when the engine moves on it's mounts - but only when the engine is warmed up. Doesn't happen from a cold start. Not related to suspension or gears or clutch. A sharp press of the accelerator (or release) will induce the noise provided the car is in gear. No noise if in neuetral. In other words when the engine is forced to significantly strain on it's mounts there's a sqeak. All engine/exhaust mounts are in good or new condition. Silicon spray doesn't improve matters.

I have a new Toyo Sports stainless manifold and downpipe with flexi. Could it be the braided stainless wrapping over the flexi-joint that's making the noise? How could that be muffled I wonder?

Jeff
J Lennon

Belt tensioner?
Charless

The car no longer has aircon nor the associated belt tensioner. The cam belt tensioner (manual type for vvc) was renewed along with cambelt and w/pump in the last 1,000 miles. In both cases, I believe the belt tension would not be affected by engine movement. I will check the alt.belt adjustment though, in case it has stretched a bit from new.

Jeff
J Lennon

Alt.belt adjusted slightly tighter - no difference, the squeak still exists.

Could it be frame to body mounts or the exhaust flexijoint causing this?

I shall find a garage tomorrow that can lift the car on a 4 post lift to discover the source.

Jeff
J Lennon

The squeak is from none of the engine or frame mounts. Nor the exhaust or cat or flexi-joint and not the suspension or shocks. It's not the brakes or wheel bearings. Not the alternator belt either!

Squeak seems to be from within the gearbox, but only momentarily when the motion is not at constant load. For example when moving forward or backwards from rest or making a sudden throttle movement (on/off) when driving normally. Obviously all the above apply when changing gear - but it is not the clutch release bearing or clutch (both recently changed). Gearbox oil was recently drained and replaced with MT94 (2.4 litres) along with new drive shaft oil seals. Mk1 shafts and Mk1 seals! There are no oil leaks. Drive shafts seem sound, with intact gaiters and only a very small amount of play on the inboard joints. Shafts move in/out of the diff by about 1mm which seems reasonable to me.

Anyone come across this before?

Jeff
J Lennon

the noise u describe is from the clutch plate beter known as clutch woop the remedy is a new clutch
j reed

I sincerely hope it's not clutch woop (whoop) Mr Reed, it's a new 3 piece in there! I did some reading about how vibration translates into various harmonics giving clonks, rattles - even clutch woop in some cases. Pocket Motors in Dorset have diagnosed it must be the lower tiebar - inspite of me soaking it in silicone lube and checking bolts for tightness. So it's coming right off for inspection shortly!.

Jeff
J Lennon

The squeak has been found - with the help of Daryl Cramer (Pocket Motors, Dorset).

It was a stainless steel jubilee hose clip screw rubbing against the bulkhead (protecting the fuel tank). The rubbing only happened with a hot engine and when the motor was moving in it's mounts under application or release of torque.

I had replaced all hoseclips with stainless jubilees and fitted a Pressure Relief Thermostat. It's quite a tight installation down near the subframe and now I need to revolve one of the jubilee screws so it can be tightened from below rather than from with the engine bay. The noise has been stopped by temporarily jamming a wad of cloth between screw and bulkhead.

Jeff

J Lennon

reminds me of an intermittent rattle I had coming from the engine bay. Turned out to be a loose bit of brake pipe after a garage that had replaced one for the MOT had patched it from below by cutting it before the section that routed up into the engine bay.

They'd left the old section up there and as it was no longer fixed it was rattling against the bodywork in line with the engine revs.

I lived with that one for a year before a clever mechanic noticed it at an annual service.
Leigh Reid

See my new thread "Lower Engine Mount in Poly".

Jeff
J Lennon

This thread was discussed between 08/08/2011 and 10/09/2011

MG MGF Technical index

This thread is from the archives. Join the live MG MGF Technical BBS now