need advice on alfa 156 2.5 v6 - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools
(Post Link) post #1 of 19 Old 10-10-09 Thread Starter
Status: -
AO Member
 
Join Date: Jun 2008
Location: United Kingdom
County: Bedfordshire
Posts: 10

Member car:

alfa 156 2.5 v6

need advice on alfa 156 2.5 v6

hi people, pls can someone just give me some advice, i recently rebuilt my engine and have driven it for 4 months, problem now is its making a knocking noise from around the engine, hav checked belt and it did jump a tooth but timming has been done, but noise still there, jus wanted to know if anybody has experinced this prob, think this is the last straw with this car as have spent loads of money on it.
montana is offline  
Sponsored Links
Advertisement
 
Status: Busy busy busy!
Club Member
Membro Premio
 
Pud237's Avatar
 
Club Member Number: 71
Join Date: Apr 2006
Location: United Kingdom
County: Cumbria
Posts: 44,880
Why not bring it in one saturday for the free Surgery and let some professionals look at it?

AutoLusso - Quality Alfa Romeo Servicing and Repairs
Pud237 is online now  
Darren156
Status: - Update
Guest
 
Posts: n/a
What Pud said mate,

Autolusso will be your best bet, take it in to them and they can tell you what's up with it, no BS either from them.
 
Chris155
Status: - Update
Guest
 
Posts: n/a
Why was the engine re-built 4 months ago?
 
Darren156
Status: - Update
Guest
 
Posts: n/a
Cambelt snapped...?
 
(Post Link) post #6 of 19 Old 11-10-09 Thread Starter
Status: -
AO Member
 
Join Date: Jun 2008
Location: United Kingdom
County: Bedfordshire
Posts: 10

Member car:

alfa 156 2.5 v6

yea cambelt snapped, had someone look at it and its comming from the bottom of the engine. getting a mechanic on to it though.
montana is offline  
Darren156
Status: - Update
Guest
 
Posts: n/a
Be careful with what type of mechanic you get to look at it mate, despite belief these engines do need to be looked at by mechanics who know Alfa's, not any old monkey wrench can look at them.
 
Status: -
AO Platinum Member
 
Ralf S.'s Avatar
 
Join Date: Feb 2002
Location: The land that Time forgot
Posts: 13,107
Unfortunately it's quite common to hear about a knocking from the bottome end a few months after a belt breaks. During the initial mayhem (a piston thumping the valves) the resulting deceleration of the moving parts makes the crank bearing shells slip or get compressed slightly. Either the bearings are damaged or the feed of lubrication to them is affected (dunno if the shells have oilways in them) .. and after a certain amount of mileage, the bearings start failing.

Ralf S.
Ralf S. is offline  
Chris155
Status: - Update
Guest
 
Posts: n/a
That seems to be a t/spark issue, allthough I've never had a problem with the bearings failing after a belt snapping even on a T/S

Its more likely to be a failed tappet IMHO.
 
(Post Link) post #10 of 19 Old 12-10-09 Thread Starter
Status: -
AO Member
 
Join Date: Jun 2008
Location: United Kingdom
County: Bedfordshire
Posts: 10

Member car:

alfa 156 2.5 v6

thanks for the replies but more likley its what ralf said, but soon as my mechanic is free and starts working on my car il let u lot know exactly what it was.
montana is offline  
Status: Busy busy busy!
Club Member
Membro Premio
 
Pud237's Avatar
 
Club Member Number: 71
Join Date: Apr 2006
Location: United Kingdom
County: Cumbria
Posts: 44,880
We've bought quite a few knocking 2.5 V6s off ebay. No idea why they were knocking, but it does happen.

If it is knocking from the bottom end, you've got another expensive rebuild on your hands again, unfortunately
Pud237 is online now  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,072
I read somewhere that V6 156's often knock because the oil fiter isn't changed when the oil is done.

Because people cannot find it or are too lazy to change it because of its location.
symon is offline  
Chris155
Status: - Update
Guest
 
Posts: n/a
Quote:
Originally Posted by symon View Post
I read somewhere that V6 156's often knock because the oil fiter isn't changed when the oil is done.

Because people cannot find it or are too lazy to change it because of its location.
I mentioned that in my GTA buyers guide. I still stand by the theory. I've also seen a blown bottom end that was caused by overheating after the waterpump failed.
 
Status: -
AO Member
 
trackstar's Avatar
 
Join Date: May 2005
Location: United Kingdom
County: Cheshire
Posts: 159
Big end bearings nowadays are not as reliable as the old fashioned materials. I believe older manufacturers used a lead element in them which was replaced by elements including nickle (Im sure I miss spelt that!)

Over the last 20 or so years I have seen many engine rebuilts due to belt breakages, where the top end is full rebuilt, valves, followers etc (ie; a proper job!) only for the bottom end to start knocking very soon after.

The theory is that during the big bang (not that I believe in the big bang ....) the whack the big end shells take puts a flat spot on the shell / shells causing a failure. This is a subjective theory, but any I have rebuilt have always had new shells, and none failed later.

If if not proven its a case to ponder, and as standard shells are circa 50 its daft not to. (always measure properly btw as Alfa list diferent colours to suit 'slight' variations

All IMHO btw.
trackstar is offline  
(Post Link) post #15 of 19 Old 08-02-10 Thread Starter
Status: -
AO Member
 
Join Date: Jun 2008
Location: United Kingdom
County: Bedfordshire
Posts: 10

Member car:

alfa 156 2.5 v6

all done and now back on road and loving my car even more.
montana is offline  
Status: Alfas gone, replaced with a Scooby import
AO Silver Member
 
davieb156's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: -
Posts: 1,642
so what was the problem in the end Montana?
davieb156 is offline  
(Post Link) post #17 of 19 Old 09-02-10 Thread Starter
Status: -
AO Member
 
Join Date: Jun 2008
Location: United Kingdom
County: Bedfordshire
Posts: 10

Member car:

alfa 156 2.5 v6

well this time as the cambelt jumped a tooth we found one of the pistons went aswell(bottom end) so my mechanic done a total engine rebuild for me this time as wanted to check every part himself.
been on the road for a month now and passed mot first time.lol- no leaks and engine sounds good.- when i get time will put pics on here.
montana is offline  
Status: -
AO Platinum Member
 
Ralf S.'s Avatar
 
Join Date: Feb 2002
Location: The land that Time forgot
Posts: 13,107
Cool! I hopes the old ship hangs together next time you go through Warp!

Ralf S>
Ralf S. is offline  
(Post Link) post #19 of 19 Old 10-02-10 Thread Starter
Status: -
AO Member
 
Join Date: Jun 2008
Location: United Kingdom
County: Bedfordshire
Posts: 10

Member car:

alfa 156 2.5 v6

so do i.lol- oh there wont be a next time.lol
montana is offline  
Reply

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

Tags
156 , advice , alfa

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



Similar Threads
Thread Thread Starter Forum Replies Last Post
So how many and where are the GTA's ??? 156GTASW Alfa GTA 608 27-10-11 09:11

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