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Technical (156)
 Alfa Romeo forum : Technical (156)
Subject Topic: Knocking 3.0 V6 Strip down (Dead) 56k! Post ReplyPost New Topic
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Chris155
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Posted: 11 September 2007 at 13:47 | IP Logged Quote Chris155

Bought a broken 3.0 V6 and a good gearbox out of a 166 last Friday. Spent my day off work removing it, some of Satuday stripping the ancilleries off (not included in the sale) and Sunday Mounting it on a stand. I started to strip it down last night after work....







Removing the gearbox. The V6 uses a pull clutch so you must remove the slave cylinder prior to trying to pull the box off the engine.





Unfortunatley, the starter motor needs to be removed and to get at one of the bolts holding it in place (circled yellow) you need to remove the rear exhaust manifold which is a real pita in car.



Clutch removed to show DM flywheel.



The 166 engine mounts are very different to the 156 set up, as is the subframe. On a 166 it forms a complete square around the engine, with the front mounts bolted to it rather than the chassis legs ala 156 Its also more difficult to remove the engine as a result.



In order to remove the mid drive shaft you need to remove the 3 bots holding it in the mount:



Putting the engine on a stand:





Removing the cam belt covers. I rounded off the hex head bolt circled red...



Removing the rounded bolt. The splined socket shown is fantastic for removing them pesky rounded off bolts.



Covers removed:



Stripping the wiring loom off the front bank:



Treacle tart and tesco finest custard!!!!!!



Removing the plenum chamber. Its suprising how much stuff you DON'T need to unbolt off it:



Its bolted to the cam over via the two hex bolts arrowed:



Removing the wiring loom to the plugs and injectors:



Ping it off with a flat blade screwdriver, just make sure you keep a finger covering it otherwise it really will "ping" off!



Injectors - green
Coil packs - red
Multi plug that lives by thermostat - yellow
Earth lead to cam cover - magenta



The intake plenum sits on several rubber bushes and they nearly always go awol. There are 4 on the plenum itself and an additional 2 on the cam cover.



Plug holes. I've put all of the loose bolts back in their respective positions. Some are longer than others and it avoids confusion.



Removing the sump. The bolts circled green hold the heat shield on over the crank sensor. The sump is held on with 11mm bolts for some bizzare reason.







Remove heat shield.



Crank sensor circled cyan. You don't need to remove it, Just release the wiring all the way up to the connector.

Remove bolts circled red.



It was at this point I started to attack it with a crow bar, not realising I had missed one hidden bolt:



Bugger!!!! To get at it you have to release the rear mount and oil filter housing. This engine is out of a 166 remember, other cars will be different.



Problem is the cast alloy plate that the alternator bolts to fouls the oil filter housing. If you unbolt the housing you should be able to get enough clearence to get at the sump bolt without removeing the alternator mount. Handy if engine is still in car. I just removed both.



remove sump....

.... and oh dear. That's a lot of metal on the pick up...



and in the sump....



Just one bearing had failed and spun on the crank within the conrod. Both are fubar. Engine is not an economical repair.





Oh well.













Edited by Chris155 on 11 September 2007 at 14:35
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symonh2000
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Posted: 11 September 2007 at 14:05 | IP Logged Quote symonh2000

That looks pretty bad. What are the heads like? You could always sell thewm if they are ok and try and reclaim some of your costs.

Do you know what caused the problems, or did it just happen.

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Chris155
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Posted: 11 September 2007 at 14:12 | IP Logged Quote Chris155

the heads should be pefectly fine. A lack of servicing or oil more than likely caused it I guess. I bought it broken....
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jeff_porter
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Posted: 11 September 2007 at 14:33 | IP Logged Quote jeff_porter

sure someone will buy it.

try Pdj30.

edit: I'm guessing lack of oil. (seen other post).

still impressive that you have the skills to strip it down.


Edited by jeff_porter on 11 September 2007 at 14:34


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daveg360
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Posted: 11 September 2007 at 15:21 | IP Logged Quote daveg360

Someone looking to do a 3.8l AH conversion might be interested - the kit comes with a new crank....

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Chris155
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Posted: 11 September 2007 at 16:20 | IP Logged Quote Chris155

If you want to go down THAT route dave I'll beuid and fit it for free!
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alfatim
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Posted: 11 September 2007 at 19:32 | IP Logged Quote alfatim

Chris, I really like your crayons, can you tell me what viscosity the custard is>

Super helpful mate!
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daveg360
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Posted: 11 September 2007 at 19:42 | IP Logged Quote daveg360

10w60 custard. Just like the V6 engines our Chris requires about 6 litres too.

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Chris155
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Posted: 11 September 2007 at 19:57 | IP Logged Quote Chris155

Oi!


7....

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daveg360
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Posted: 11 September 2007 at 20:07 | IP Logged Quote daveg360

Lager

15 litres

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pascs
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Posted: 11 September 2007 at 20:34 | IP Logged Quote pascs

Great pics as always......pity it didnt work out but at least you've got plenty of parts

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Thompatruck
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Posted: 12 September 2007 at 10:59 | IP Logged Quote Thompatruck

Quote:
It was at this point I started to attack it with a crow bar, not realising I had missed one hidden bolt:


I'm not saying a word mate

Good job though

Edited by Thompatruck on 12 September 2007 at 10:59
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