156 cambelt damage- is the engine for the bin - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools
(Post Link) post #1 of 8 Old 10-09-07 Thread Starter
Status: -
 
Join Date: Jun 2006
Posts: 1
156 cambelt damage- is the engine for the bin

Hi all,

My names Rich - new on here & it makes interesting reading.

Lots of enteries about cambelts - just taken the cover off my 156 1.8TS which cut out, noticed that the tensioner had failed, cambelt was still on. When I tried turning it over just the big end was spinning round and stripping the belt teeth (i know that's bad !!). Anyway I can turn the bottom end by hand and it turns fully without any noises or sound of bent valves - is it possible that the tensioner failed but I've not clattered the valves ?

When turning it over with plugs in I get no resistance - thought I would - other than a compression test any ideas how I check if valves are bent ?
Rookirods1 is offline  
Sponsored Links
Advertisement
 
Status: One foot in, one foot out!
AO Platinum Member
 
zulu ferret's Avatar
 
Join Date: Oct 2006
Location: wgc
County: herts
Posts: 42,278
Re: 156 cambelt damage- is the engine for the bin

I'm no expert, but I reckon you have the worst case scenario.: Head off job for starters?:

Last edited by zulu ferret; 10-09-07 at 17:50.
zulu ferret is offline  
Status: -
AO Platinum Member
 
David C's Avatar
 
Join Date: Aug 2003
Location: London, England
Posts: 29,958
Re: 156 cambelt damage- is the engine for the bin

Quote:
Originally Posted by Rookirods1 View Post
is it possible that the tensioner failed but I've not clattered the valves?
No

Valves & pistons will have hit each other.

As ZF said, head off to start with.
David C is offline  
Status: -
AO Member
 
okenora's Avatar
 
Join Date: Feb 2007
Posts: 338

Member car:

156, 2.4jtd

Re: 156 cambelt damage- is the engine for the bin

Bad news is NO, there's not hope that the belt or tensioner has failed without valve damage. Sorry.
okenora is offline  
Status: -
 
Join Date: Apr 2007
Posts: 28
Re: 156 cambelt damage- is the engine for the bin

I had a cambelt snap on a transit once and did'nt get any bent valves...just put on a new belt and it was fine ...but most of the time a snapped belt means bent valves

Al
FZR..AL is offline  
Status: Freezing!
AO Silver Member
 
Rockhopper's Avatar
 
Join Date: Mar 2007
Location: United Kingdom
County: Nottinghamshire
Posts: 5,266
Re: 156 cambelt damage- is the engine for the bin

The Alfa engines run much tighter clearances between the pistons and the valves than some other cars, plus with there being 16 of them there is no positon where all the valves will be shut to allow the crank to continue rotating without the pistons hitting at least some of the valves.
Rockhopper is offline  
Status: -
AO Member
 
Join Date: Mar 2007
Location: Australia
County: Queensland
Posts: 609
Re: 156 cambelt damage- is the engine for the bin

As i undertand it the 4cyl petrol engines in the 156 are an "Interference" type, ie. a broken timing belt will cause the heads of the valves to impact the tops of the piston resulting in damage. Not all engines are "interference".

I've been lucky and never had the misfortune of a broken belt (in any car, touch wood) - on the other hand I did bounce a valve in my sprint once over reving her (sounded glorious) ... resulting in a bent (valve) stem

Just to hijack you thread ontopic of course.. does anybody know if the 1.9JTD (8valve) is an interference engine ?.. I want to know how concerned i should be about her cambelt. I'm guessing it is pic link

Last edited by craig_m67; 11-09-07 at 22:53.
craig_m67 is offline  
Status: age is only a number ;-)
AO Gold Member
 
rgwm's Avatar
 
Join Date: Aug 2004
Location: Burnley-ish
County: Lancashire
Posts: 9,487
Re: 156 cambelt damage- is the engine for the bin

Agreed that the valves WILL be bent...sorry. Also at the risk of being repetitive - I say this a lot on here....I highly recommend dropping the sump and changing the big end shells when the head is reconditioned - the piston-meeting-valves scenario often causes the big end shells to get nipped, resulting in bottom end failure shortly after a cambelt failure....

A second-hand replacement engine will cost about £700 - there are people on Ebay - one near me called Engine Express - offering rebuilt heads for about £320 including gaskets IIRC. A belt and tensioner kit is about £100 - tho shop4parts have the kit on offer this month....

Hope this helps.

Richard

AROC Vice-Chairman and Lancashire Section Secretary

Alfa organ donor to the gentry......
rgwm is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Engines (TS, JTS, JTD & V6)

Tags
156 , bin , cambelt , damage , engine

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome