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Old 04-22-2015, 12:42 PM   #1
R-dubb OP
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Question Guzzi V7 Sport - Bad chest pain

What do bad Agostini timing gears sound like and what can be done?

I own two old school Guzzi's long term. Never get into serious work because they are so damn reliable. Any how my '73 v7 starts like a champ, runs strong, but has gradually begun making a really loud clank associated with the valve train. Smooths out at higher engine speeds. At idle it varies from loud-ish (like loose tappet) to exceedingly loud clanks intermittently until the engine speed changes. More than a rattle. I'm thinking timing chest. No hic-cups or any running issue associated. Valve clearances are set and tend not to move.

Here's the thing. The engine was rebuilt by the PO over ten years ago. New top end and timing gears to replace the chain, which I understand my motor had originally. It's been delightful for the 10,000 or so miles I've put on it in the past 10 years.

Any help appreciated.
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Old 04-22-2015, 01:02 PM   #2
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Drop the oils and inspect for chunks....
Take a compression test. 130 -175 would be OK
Big bad noises are a sign.....
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Old 04-22-2015, 01:03 PM   #3
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new top end meaning replaced the chrome bores?
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Old 04-22-2015, 01:04 PM   #4
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Originally Posted by lrutt View Post
new top end meaning replaced the chrome bores?
Just pull the front cover off and take a look. More accurate than guessing
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Old 04-22-2015, 01:20 PM   #5
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As mentioned the whole top end was upgraded 10,000 miles ago. Pistons, jugs, valves, seats and the gears were installed. At least a B+ restoration overall.

I'm really looking for a sequence here.

1. Compression/leakdown test (virtually sure its good because it makes strong power and starts on the first pop)
2. Drop oil pan and look for nasties.
3. Open timing cover and inspect gears.
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Old 04-22-2015, 11:39 PM   #6
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Quote:
Originally Posted by R-dubb View Post
As mentioned the whole top end was upgraded 10,000 miles ago. Pistons, jugs, valves, seats and the gears were installed. At least a B+ restoration overall.

I'm really looking for a sequence here.

1. Compression/leakdown test (virtually sure its good because it makes strong power and starts on the first pop)
2. Drop oil pan and look for nasties.
3. Open timing cover and inspect gears.
if you havent got it , get the proper tool to tighten the crankshaft nut,
i have hunted a weird knocking noise on a v7sport, it knocked at idle , and smoothed out at high revs.
ended up being the timing gear had worked loose , and was knocking against the key.
i am not sure what you are expecting to find in the sump? i cant imagine finding anything valve train related there.
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Old 04-23-2015, 03:50 AM   #7
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Quote:
Originally Posted by R-dubb View Post
As mentioned the whole top end was upgraded 10,000 miles ago. Pistons, jugs, valves, seats and the gears were installed. At least a B+ restoration overall.

I'm really looking for a sequence here.

1. Compression/leakdown test (virtually sure its good because it makes strong power and starts on the first pop)
2. Drop oil pan and look for nasties.
3. Open timing cover and inspect gears.
Compression test will tell you nothing about your knock.
Given that it goes away at certain instances it's likely not a serious rod knock or something.

So....open the timing chest and take a look. That is what you need to do first, not last.
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Old 04-23-2015, 07:36 AM   #8
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Quote:
Originally Posted by huub View Post
if you havent got it , get the proper tool to tighten the crankshaft nut,
i have hunted a weird knocking noise on a v7sport, it knocked at idle , and smoothed out at high revs.
ended up being the timing gear had worked loose , and was knocking against the key.
i am not sure what you are expecting to find in the sump? i cant imagine finding anything valve train related there.
Good comments. I like the suggestion to check the gear nuts. the only reason for a look in the sump is to see if i'm shredding something. Might give clues.

The only other malady this bike ever faced was the the front facing nut on the layshaft backed off and punched right through the case. That was a fun fix...
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Old 04-23-2015, 10:59 AM   #9
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Big end shells another place to look. They do rot if let sit.

The replacement gears have a mixed rep.

Maybe call Moto Guzzi Classics and see what Mark says. If you need parts he'd be the first stop anyway.
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Old 04-23-2015, 05:49 PM   #10
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Big end shells another place to look. They do rot if let sit.

The replacement gears have a mixed rep.

Maybe call Moto Guzzi Classics and see what Mark says. If you need parts he'd be the first stop anyway.
Another great suggestion. Is it possible to inspect the shells from the bottom?

I'm aware of the gear issues. If they are bad, I'll probably just find some used sprockets and go back to stock. I can see this beauty potentially tying up my lift for a long time....
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Old 04-24-2015, 03:16 PM   #11
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Errrr, I've got one too. They actually come standard with gears, not chain...


http://www.thisoldtractor.com/mg_man...og_v7sport.pdf
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Old 04-24-2015, 07:19 PM   #12
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Errrr, I've got one too. They actually come standard with gears, not chain...
Timing chain started with engine no. 33448.
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Old 04-24-2015, 07:21 PM   #13
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Originally Posted by BOOTLACE View Post
Errrr, I've got one too. They actually come standard with gears, not chain...


http://www.thisoldtractor.com/mg_man...og_v7sport.pdf
Close, no cigar for you.. PO was telling the truth when he told me. Richardson says from engine #33448 they have chains. Mine is #33535.
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Old 04-24-2015, 08:36 PM   #14
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Perhaps lucky for me, I may have made a mountain out of a mole hill. Got her up on the lift where I can get a good listen. Not the timing chest. Not the bottom end. The valve gear on the right side is loud as can be. Much louder than the left. I'll open it tomorrow and see what the heck I've done wrong.
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Old 04-24-2015, 11:24 PM   #15
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OK! Mine is 438...
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