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12500 Service Advice

mg_sparky

mg_sparky

Tuned and Synch'ed
Joined
Jan 7, 2009
Messages
26
Location
San Diego, CA
For those of you with experience conducting the 12,500 service on the Norge, I'm interested in your opinion on weather or not it's easier to remove the engine to replace the inner plugs and torque the timing belt, or if busting some knuckles with the engine in is a better option.

I've read a couple of clutch horror threads which is making me think that I may want to drop the engine just to inspect the clutch.

I appreciate your thoughts.

Kurt
 
The inner plugs can be changed easily enough with just the tank removed. You just need to make a thin wall socket to go in there. It probably doesn't need replacing, but I would coat the threads with anti seize compound. Search for Grahams thread on the Breva. Once you get the tank off it is the same. As for the alternator belt, leave it alone. Better if it is a little loose than tight. If the alternator is charging, it is tight enough. Besides, Guzzi has never given the torque spec for the belt. Search the forum and you will find plenty on the belt too.
 
mg_sparky said:
John,

Thanks ... sound advice.
The belt torque spec. is 50Nm (CHAR-12 Timing System Unit)

Kurt
Click to expand...

That spec sound pretty high, it equates to 37 lb-ft. That is more than an old style engine head torque. I would think that much tension would take out the belt and the alternator bushings. Where did you find it? There are supposed to be two torque values, one for a new belt, and a different spec for a used belt.
 
John,

It is in the Norge Service manual (CHAR-12). There's only one spec. It did sound a bit high but it may be that mechanical offset of using the belt adjustment tool reduces the actual torque applied to the belt (i'm just guessing here.)

Kurt
 
mg_sparky said:
John,

It is in the Norge Service manual (CHAR-12). There's only one spec. It did sound a bit high but it may be that mechanical offset of using the belt adjustment tool reduces the actual torque applied to the belt (i'm just guessing here.)

Kurt
Click to expand...

Found it. I wouldn't consider the alternator belt part of the "Timing System" but then I don't think like a Guzzi Technical writer. Unfortunately I have the other type of tensioning tool that will push the alternator straight up. I think I'll have to stick with the turn the belt 90 degrees rule.
 
I went and checked my BMW service manual for oil heads as they use a similar belt to drive the alternator. The specification for BMW is 8 Nm or 6 lb-ft. In light of this, I would consider the torque specification (50 Nm) in the Guzzi manual to be an error. It wouldn't be the first time to find erroneous information in a Guzzi manual as they have erred with the correct head torque procedure for the new style engines.
 
Never heard of anyone taking an engine out to do a service!!! seems to be asking for more trouble than it saves.
 
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