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3rd engine that fails... Main bearing problem

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3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Sun May 22, 2016 3:23 pm

Hi guys,

I replaced my broken '83 750 engine with another 750 engine that developed a problem with the second gear.

I found and installed a xv1000 engine but now this one developed a knocking sound. I tore it apart and found that the main bearing is the problem.

I would like your opinions on what to do, rebuild the 1000 engine with 2 new main bearings (will need to do the rod plane bearings too) or redo the 750 engine with the transmission from the xv1000 engine?

Is it possible to use the xv1000 transmission in the 1st gen 750 engine at all?
Does anyone know where to get main bearings for a reasonable price? The best I found was € 180,- per bearing...!

Anyways, looking for a solution that will not break the bank....

Any help is appreciated

Regards, Ron





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RonWestle
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Bike year & model: 1983 Virago XV750
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Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: Octania » Sun May 22, 2016 9:02 pm

Engine from yet another parts bike and parting out your bad engines may be the best cheapest fastest solution.
1981 XV750, aftermarket pipes
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Here to find and provide help if possible
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Re: 3rd engine that fails... Main bearing problem

PostAuthor: o c t o r » Sun May 22, 2016 9:22 pm

Bearings from the 750 and the 1000 are the same

xv750
2 - 93306-30804-00 BEARING . . . . . . . . . . . . . . . . . 1 X7-0001015 015130
93306-30808-00 BEARING (3EF) . . . . . . . . . . . . 1 4X7-0151315
3 - 4X7-13354-00-00 SPROCKET, DRIVE . . . . . . . . . 1
4 - 93306-30805-00 BEARING . . . . . . . . . . . . . . . . . 1 4X7-0001015 015130
93306-30808-00 BEARING (3EF) . . . . . . . . . . . . 1
xv1000
2 - 93306-30808-00 BEARING (3EF) . . . . . . . . . . . . 1
3- 4X7-13354-00-00 SPROCKET, DRIVE . . . . . . . . . 1
4 - 93306-30808-00 BEARING (3EF) . . . . . . . . . . . . 1

I haven't checked lately but I believe the 1100 and 700 are the same as well

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Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Mon May 23, 2016 2:17 am

Hi thanks for the part numbers and info.

I checked the cost for the bearing at some other sites and found that they cost around the $65/$70
That sounds better then the $180,-!

As I have had 3 engine failures I thought it would be nice to have an engine where I know it is sound and checked all over. I cannot find another one over here in the Netherlands at the moment and the ones that were for sale some time ago were doing like $500,- asking price.

But some questions I have:

  • Does a xv1000 transmission fit a XV750 engine?
  • How do I know what plane rod bearings I should order, they come in 8 different types / colors...

Ron

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Re: 3rd engine that fails... Main bearing problem

PostAuthor: nanno » Mon May 23, 2016 12:58 pm

XV1000-Transmission will go straight into the 750 cases.

If you're rebuilding the XV1000 crank, make sure that the oil-pressure-relief valve isn't sticky.

Cheers,
Greg
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Thu May 26, 2016 1:49 am

nanno wrote:XV1000-Transmission will go straight into the 750 cases.


Thanks for your answer Greg, I will go this route. Also thinking of using the XV1000 2nd gen starter to upgrade the older one in the 750 case. Will have to look if I have the famous hole though...!

Ron

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Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: nanno » Thu May 26, 2016 6:12 am

Yes and really, really check your oilpump and the relief valve.

If you still have the small oilpump on the engine you plan to use, upgrade to the later, bigger screen model. (Also found on late TR1s, XV750ies, XV1100s, BT1100, XVS1100s.) Can be installed even without removing the rotor, but you have to take it apart for installation.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Thu May 26, 2016 6:21 am

nanno wrote:Yes and really, really check your oilpump and the relief valve.

If you still have the small oilpump on the engine you plan to use, upgrade to the later, bigger screen model. (Also found on late TR1s, XV750ies, XV1100s, BT1100, XVS1100s.) Can be installed even without removing the rotor, but you have to take it apart for installation.


Ah didn't know that about the Oil Pump.

Can I remove the Oil Pump and check the filter without removing the Flywheel?
I tried on the xv1000 engine but couldn't get it out.

Ron

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Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: nanno » Thu May 26, 2016 6:24 am

Yes you can, just remove all the PH-screws, then you can remove the outer shield and sprocket. The rest will then just come apart and the chain remains on the crank.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

*Look to my profile for a link to my blog*
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Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Thu May 26, 2016 6:30 am

And the relieve valve is that accessible from the bottom of the case?
It seems to be only accessible after splitting the cases...

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Single intake manifold
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Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: faffi » Thu May 26, 2016 7:19 am

A 750 crank should also fit the 1000 engine, I believe, although it may be balanced slightly different, which can cause more noticeable vibrations due to the heavier pistons from the larger engine.
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Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Thu May 26, 2016 9:18 am

RonWestle wrote:And the relieve valve is that accessible from the bottom of the case?
It seems to be only accessible after splitting the cases...



Never mind, I found you can only access it if you split the cases...

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1984 Virago XV1000 Engine
Single intake manifold
Motogadget M-unit 2 and M-button harness
Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Thu May 26, 2016 10:44 am

I noticed that the chain tensioners on the XV750 Engine differs from the ones on the XV1000 engine.
One has a big nut on it and the other one a rubber cap.

Which ones are the best to use?

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Bike year & model: 1983 Virago XV750
1984 Virago XV1000 Engine
Single intake manifold
Motogadget M-unit 2 and M-button harness
Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: faffi » Thu May 26, 2016 4:16 pm

Yamaha probably changed the design for a more reliable seal and simpler access. I'd use the later ones from the 1000 if the bike was mine.
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Re: 3rd engine that fails... Main bearing problem

PostAuthor: RonWestle » Fri Jun 03, 2016 5:08 am

Can anyone tell me why it is important to align the intermediate cam chain sprocket?
You time the cam on the crank anyway... I don't get it....

15070
15071

Thanks, Ron

RonWestle
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Bike year & model: 1983 Virago XV750
1984 Virago XV1000 Engine
Single intake manifold
Motogadget M-unit 2 and M-button harness
Sex: Male

Re: 3rd engine that fails... Main bearing problem

PostAuthor: nanno » Sat Jun 04, 2016 11:12 am

Because otherwise you won't be able to match all the marks on the rotor and the cam-sprocket.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

*Look to my profile for a link to my blog*
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1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male



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