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(Post Link) post #1 of 6 Old 12-06-13 Thread Starter
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2.5 V6 questions!

Im finally getting a propper Alfa.. 156 2.5 V6 However some questions for it.

What fuel should I put in it? Used to put in 98 Oktan in my 159 but I heard the Twinspark didnt like 98 that much, same with the V6?

Which oil is best for it? Or even better, what class for it? (Like: Fiat 9.55535.H2) Will Pennzoil Performax 5W-40 do? (Ferrari approved.. )

The idle seems to be a bit uneven, but it havnt been moved for months! Probbly lifters making slight noice and need sparkplugs wouldnt be too bad. Also going to check for airleaks.

Anything else I need to know about the V6? Same timingbelt intervall as Twinspark or?

Trying to get more active.. >_<
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Grahameo
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95 Ron octane is fine
10w-40 semi synthetic for normal use or if you have a spirited driving style,10w-60 fully synthetic @ 5.5 ltrs for full oil change.
Cambelt is still every72,000 or 5 years but only a fool would take it that far... 56,000 or 4 years maximum seems to be a safe period. A complete tensioner and guide roller change is vital, along with a metal impeller water pump every other belt change if not already replaced. Plastic impeller water pumps tend to crack and slip causing overheating and eventual gasket failure.

If it's been standing and making a rattle on start up it will be the cambelt tensioner, the coil spring inside tends to sieze if left for more than a week. Remove the upper cam cover and look at the tensioner once started, you will notice a little outer peg hopping up and down causing the noise. Turn off and use a long file or flat screwdriver carefully as not to damage the cam belt. Press down firmly and slowly with even pressure on this peg... A healthy tensioner will let the peg move down, a seized spring won't.

Don't put masses of pressure on it as you can inadvertently release the tension by pressing too hard and the belt can go loose on the teeth, it's just a test to confirm the cause of the noise!

Check the tightness of the belt between the top left cam pulley and top idle roller, if it's it has virtually no flex at all, continue to the next paragraph below..... If it has flex of more than 5mm in such a short distance, get it booked in for a belt tensioner change now...


Sometimes all they need is to be used constantly for a few days and presto, the noise disappears, particularly a motorway run of 20+ miles...
Unlike other Alfa engines, the Busso V6 Luke's to be used daily, they don't take kindly to sitting for long periods... They need to be ran.

If it's still giving the same rattle after that, a new belt and tensioner should be changed ASAP or it could snap or release tension without warning at anytime.
You might get away with it.
Best of luck

Last edited by Grahameo; 18-06-13 at 23:57.
 
(Post Link) post #3 of 6 Old 21-06-13 Thread Starter
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Thanks for answer, ill check and listen again extra carefull when I pick it up next week.. It have already stand still for 2 weeks after that then.

How sensitive is the tensioner? The cambelt was changed for 12,000 miles ago but I didnt check year.. <_>

I asked for an oil change before I pick it up and I dont remember a specific rattle at start..the sound was remaining and sounded like lifters to me, but I can be wrong!

I'll post an sound video once I picked it up and recorded. It need to be running this summer..I got a ~6,000 miles trip to do

Edit: Oh btw..how hard is it to remove cambelt cover?
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rxe
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The lifters are hydraulic and will have leaked down if it has been standing - you may well get quite a tapping on start up. This should all be gone within 20 seconds or so.

If a lifter keeps tapping, the drilling may be a bit varnished up, it is very small. We had one tapping on ours, and the solution was an oil flush (Forte additive, recommended by a specialist who knows his stuff), and an oil change. Over the next week, the tapping vanished, and hasn't come back 15K miles later.
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(Post Link) post #5 of 6 Old 21-06-13 Thread Starter
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Will tensioner sound the same when engine headed up? Just so to find out eaiser if its tensioner or lifters.
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Never had the tensioner make a noise on mine, but a loud regular tapping at the top us usually a lifter.
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