306Diesel. Cam belt slipped & brakes lost

I have a 306 Glx/TDi - S reg.

Yesterday it suddenly started ratting very loudly from the engine way, the
engine lost power (but still ran) but the brakes seem to have lost the
servo.
Looking under the bonnet I can see the Cam Belt has slipped sideways partly
off the pulleys.

Cannot get to garage until Monday, but wondering if the Cam belt slipping
could cause loss of servo power, or if ther may be something more critical
happened. I know its impossible alomost to diagnose like this, but any
suggestions / ideas so I can prepare for the worst appreciated.

Note: Cam belt was replaced about 20K miles back when the altenator belt
snapped and maneged to get trapped in it.

JB

 

If it's slipped and lost timing and if it hasn't put a valve through a
piston, then you've most likely lost the valve timing which would make any
engine lose power. Dunno about the servo though, not on diesels.


--
Malc
R1100RS old and tatty

You laugh at me because I am different
I laugh at you because you are all the same

 

It is possible that the timing belt has slipped one tooth. I had that
happen when my alternator belt broke at 70mph on the M-way and a piece
of it got between the timing belt and the crankshaft pulley. It
sounded like a box of spanners and couldn't pull the skin off a rice
pudding but still went.

I don't know how the vacuum pump is driven on the HDi engine, on my
old 205 it was belt driven off the oposite end of the camshaft to the
timing belt.

 

Hi,

From 1991 or so, without power steering, the vacuum pump is camshaft-driven.
It's the same with HDis, whatever they have PAS or not : camshaft driven
(direct drive, no belt).
A lost of servo involving the pump could be a crack in the pipe (there's
only one on these pumps), or a leak / slight oil level drop in the engine
(but I can't imagine it to happen without lighting the oil pressure light).

HTH,

 

If it's direct drive, not working properly and rattling then maybe the drive
is stuffed or the pump is coming loose or otherwise.

 

A drop in engine oil level wouldn't cause loss of servo.

Either the pump isn't being driven, or the pump is U/S, or there's a leak.

Steve

 

Hi,

In fact, I wrote this one 'cause when I asked my local mechanic why the pump
only had 1 pipe instead of 2 for older, cam-driven pumps, he told me it was
the oil movement which caused the vacuum into the pump. Perhaps I didn't get
it the right way.

It cannot not being driven. Leak, worn pump, cracked pipe from pump to
servo, or servo membrane cracked are the only suspects I see.
The fact it's simutaneous with the cambelt incident is a bit amazing to me,
perhaps just some bad luck.

Regards,

 

Actually GT, the drive can fail.

My 306TD suffered a sheared drive to the vacuum pump - it's a good job the
cambelt was in good order because I feel a weak belt would have suffered
lost teeth as a result of the sudden extra load.

At the time I had a Chrysler 440cid (big block - very heavy) engine in the
boot and was slowing down for the pay station on the M6 toll, I rolled past
the lady and had reverse back up. She joked and said I was trying to avoid
paying!

I fitted one from an old ZX engine - different fittings, but with some
vacuum hose and clips I soon had it working fine.

Julian.

 

Hi,

I stand corrected.

Regards,

 

Got the car back from the garage today.

Here is what the problems were;

The alternator belt had shredded (but not snapped completely) and become
dragged into the Cam belt, causing it to slip and buggereing up the timing.

At the same time, whether by bad luck, coincidence, or because it was on the
verge of failing anyway, the Vacuum Pump, which is driven off the cam belt I
understand from the mechanic, failed.

The alternator belt tensioner also had to be replaced. This is the second
alternator belt I have had go, and both times they have caused the Cam Belt
to shift.

JB

 

Dont you have a cover over the cam belt?? just cant see how a fan belt can get inside to get on to the cam belt there should be a cover over the cambelt and pullys.

 

It does, seen it myself.

It gets wedged between the pulley and cover and flails around ripping and
smashing the cover - next is the cambelt.

Fsucking poly V belts - whatever was wrong with an old fashioned normal
belt!



Julian

 

What u got the v belt cant you fit a flat belt to it or not, they have problems if not tight.make a noise like you got a bird under the bonnet,untill it is warm then i think its dead because it goes very quite,