I've got a 2GM20F on my 26.
I agree it is a pain adjusting alternator belt tension. I put a large crescent wrench handle down between alternator and block and use it as a lever. But be careful. There's an oil pressure sensor down by the oil filter and a few other delicate parts. Make sure the bottom end of the lever is pushing against the block, not anything that can break. 
Once the 12 mm bolt on the adjustment arm is nipped up, it will hold the tension so final tightening of the bolts can be done. 
sam :-)

From: Aaron Rouhi
Sent: Tuesday, December 3, 2013 7:07 AM
To: cnc-list@cnc-list.com
Reply To: cnc-list@cnc-list.com
Subject: Re: Stus-List Stiff throttle and belt recommendations for Yamar 2GM20
on cnc 30 mkII

3) I don't own a belt tensioner so instead I use an Irwin Quick Grip Clamps/Spreader to tension it. Not ideal but it works...

Cheers,
Aaron R.
Admiral Maggie,
1979 C&C 30 MK1 #540
Annapolis, MD



Date: Mon, 2 Dec 2013 22:03:28 -0800
From: kevindrisc...@gmail.com
To: cnc-list@cnc-list.com
Subject: Stus-List Stiff throttle and belt recommendations for Yamar 2GM20 on cnc 30 mkII

Our new to us 30-2 started sounding a bit hollow and throwing some stream out of exist the other night so I opened the water pump Sunday and found this: https://docs.google.com/file/d/0BwhcX19YaPJ8N3E0cmJrYWwyTlE/edit?usp=docslist_api  Only one of the fins appeared to be completely in tact

So my questions are:
(1) - What is the best toothed belt easily obtained as a replacement? (I read the Yanmar belts were less than stellar)
(2) - How would you clean pullies before reassembly?
(3) - 30 mk-2 owners....How the h€ll does one tighten an alternator belt on the 2GM20 with the nut facing the back of the nut facing the stern and almost completely inaccessible.
(4) - The throttle is painfully stiff to the point I almost need two hands to move it. Is there an easy  lubrication point to get it moving again till I can replace the cable?

Thanks everybody.

Kevin
s/v Osprey
C&C 30 mkII

Pic from Thanksgiving: https://docs.google.com/file/d/0BwhcX19YaPJ8QWtlbGE2NzhYRzQ/edit?usp=docslist_api

Sent from my Tablet


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