widemouthfrog said:

Well, you have at least explained why some folks here say "What are you talking about, it fits easily", while others swear blind there's no way to get it in/out without (re)moving the driveshaft.

Looks like you'll have to loosen the halfshaft mountings. Have you seen this thread?:
https://www.fiatforum.com/multipla/229971-replacing-alternator-jtd-115-a.html

Can you post a photo of the back ends of the two alternators, showing the Denso spec labels?

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widemouthfrog said:

The 100A one looks A LOT bigger. Are the two black plastic mouldings on the back ends the same size?

Do you reckon you could get the Multipla scissor jack between the back of the engine block and the bulkhead, then use it to push the engine forwards (gently!)? I'm trying to visualise it now, but thinking the steering rack will get in the way.

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widemouthfrog said:

I've just been digging through the Denso alternator application charts. Saved out the Multipla page as I though it may help.

Curious thing is, they don't list a 100A one for any version of the Multi. Also, their part numbers don't seem to appear anywhere on the labels in the photo you posted.

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widemouthfrog said:

OK. Looks as though the 90A is this one (DAN520):
http://www.woodauto.com/Component.aspx?Ref=DENDAN520

While the 100A one is this (DAN501 - actually says it's 105A in the detailed specs - go figure):
http://www.woodauto.com/Unit.aspx?Man=FIAT/MARELLI&Ref=46765838

So it is at least suitable for the Multipla. Has your car not got air con?

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widemouthfrog said:

Using the larger capacity alternator won't do any harm. So it's just a case of getting the bloody thing in there. One of the OS engine mounts will need to be unbolted; not sure if it'll be best to do the top one (up by the top of the OS strut) or the bottom front one. I think the latter will give you more freedom of movement, but it's harder to get at and you'll have to push a lot harder to move the engine - hence the scissor jack suggestion. The top mount is easy to unbolt bot I'm not sure if it will give you much free movement in the direction you need it. Might be worth trying that one first though, as it's easy to do. I need to look at my car in daylight to make sure.

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widemouthfrog said:

It's forward/outboard of the engine block, underslung from the chassis rail that runs across the front of the car and not very easy to get at. Item 1 in the picture. Also, once released, the engine will drop as it hangs from the mount.

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widemouthfrog said:

You need to shift the bottom of the engine forward, taking the gearbox and halfshafts with it. So taking the front mount (1) out of the way makes sense as that's fixed to the bottom half of the engine. However, as you lol'd, everything will drop like a stone & will probably be a pig to get back into line. You could put a jack under the engine, but I'm not sure how kindly the cast alloy sump on the JTD will take that sort of treatment. Others here may be able to advise. Taking the top link (7) out however is easier to do and the engine will just sit there, even with the link bolts (11) or (9) removed. I'm not sure how much extra clearance you need to get the alternator in, but if it were me, I'd try releasing the top link, then put the scissor jack under something solid at the back of the engine to 'tip' it forwards. It will likely pivot on the (1) engine mount but may give you the space you need.

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