sludge in classic 4C MVs - MVAgusta.net
 
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post #1 of 6 (permalink) Old 06-30-2016, 03:45 AM Thread Starter
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sludge in classic 4C MVs

I just came across this which some members will have seen but for the others it's worth considering.

OK MV nuts, I did another motor teardown this weekend and pulled a lot of
crap out of a Sport crank. I see this all the time, sludge and debris in the
crank cheeks filling up the groove. As usual the culprit is the damn weak
magnet in the drain plug. The owner was here to witness, as we dove into the
motor taking it apart and assessing what it needed for rebuild. He was
shocked to see the crap I was digging out. The material was all magnetic and
if his magnet was working it wouldn't have been so polluted. So here is a
little advice. On your next oil change, take out the crappy MV installed
magnet and install a neodymium magnet and most of the trouble will be gone.
Plus, you will see a much bigger collection of crap on the new magnet when
you change your oil the next time. Double goes for the singles and twins
that don't have the magnet. If you don't feel comfortable doing the magnet
swap, let me know, I can do it, or epoxy some into your sump. - Albert

A good source of those magnets is old computer disk drives.
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post #2 of 6 (permalink) Old 06-30-2016, 04:41 AM
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Exactly what we found in the Felotti and spoke to Albert about this and he said its common with the twins because of the crap oil filtration and was coming up with something for owners.
News to me about the 750s , time for that oil change was planning on doing it now anyway. cheers

1946 Mv Agusta "98"
1955 Mv Agusta 175cs
1960 Mv Agusta Rapido sport 150
1974 Mv Agusta 750 sport
1977 Mv Agusta 350 Felotti
2004 Mv Agusta F4 SR
2005 Mv Agusta Tamburini
2001 Ducati Mh900e Carbon dream
2004 Ducati 998R
2015 Vyrus 987
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post #3 of 6 (permalink) Old 07-03-2016, 01:05 PM
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I would like to know how often the oil and filter was changed on these engines before getting too excited
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post #4 of 6 (permalink) Old 07-04-2016, 02:19 AM Thread Starter
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The original post was from Albert Bold who has been working on classic 4C MVs for 20+ years.
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post #5 of 6 (permalink) Old 08-03-2016, 11:57 AM
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sludge...quite unbelievable..!!

That was my bike that Albert Bold was talking about. I was there and helped in the disassembly of the motor. I've owned the bike 33 years and the oil is changed often , the bike has shy of 28k km, out for a thrashing once a month at least. Decided to tear down the motor after a bevel gear box failure @ the driveshaft, as it shares the same oil as the engine . It looks like we caught it in time, as it appears there was no damage to the bearings . The crank has some ridges on the sides that throws oil into the rod big end journals which are hollow and lets oil flow to the rod. the amount of stuff, kinda like hard dirt, that came out of those you would not believe. He flushed it with a parts cleaner and used wire tools,etc. to get in those areas and dig it out .metallic dirt..!! The split roller mains were perfect, pistons looked new , bores worn about .001. I did not want to tear into the motor , it runs so good, yet I don't think you can afford not to in my case. Albert's seen rod failure on these beyond 20-25k mi due to oil starvation @ the rod. Oh, and he's got about 40 yrs with MVs.. Lee
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post #6 of 6 (permalink) Old 08-03-2016, 01:07 PM
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Thanks Mr Lee
Can you tell me what oil was used and if the filter was changed at the same time.
Also are you aware of later filters not sealing properly allowing unfiltered oil to pass unless modified
Thanks
Dave
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