Engine was knocking... Now it's not... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 07-10-2011, 05:26 PM Thread Starter
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Engine was knocking... Now it's not...

My old basket case 85 VN700 was a parts bike before I got it, came with a 94 VN750 I've since sold...

It ran from the beginning but had a very loud knock/slapping under load, I've had it stripped down to nothing but the frame and engine learning what I could from it. I found the previous owner did a partial ear shave, he put K&N's on the carbs but that was it, I removed all the excess, breather box, tubing, evaporator and California emissions...

I got around to putting the pieces back together and must've done something right, there is no longer a knocking coming from the beast.. running smoothly even under load...

Could the partial ear shave have anything to do with it?


85 VN700 Project Bike
Earshave
R/R Relocate
Mustang Seat
Custom grill cover
Busted Engine... removed, split, waiting on parts
Cleaning up & painting the rest

Parts still needed... wanted...
11" shocks, or one stock
Aftermarket exhaust... eventually
Extended forward controls or custom hwy peg mounts for my cramped legs...
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post #2 of 16 (permalink) Old 07-10-2011, 06:32 PM
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The valve that is under the seat for the emmission does make a little bit of a knocking sound. I am not for sure that is what you were hearing. Also the acct's will make knocking sounds that go and come.

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post #3 of 16 (permalink) Old 07-10-2011, 07:19 PM
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Quote:
Originally Posted by niterider View Post
The valve that is under the seat for the emmission does make a little bit of a knocking sound. I am not for sure that is what you were hearing. Also the acct's will make knocking sounds that go and come.
I vote for the emissions valve being the culprit.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #4 of 16 (permalink) Old 07-10-2011, 10:24 PM Thread Starter
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new development, it pissed all the coolant out the small breather hole in the bottom of the crank case, oil and water are not mixing, now what... bad or missing seal somewhere? this could have been the culprit as well... looks like I'm going in deeper... maybe water pump seal.


85 VN700 Project Bike
Earshave
R/R Relocate
Mustang Seat
Custom grill cover
Busted Engine... removed, split, waiting on parts
Cleaning up & painting the rest

Parts still needed... wanted...
11" shocks, or one stock
Aftermarket exhaust... eventually
Extended forward controls or custom hwy peg mounts for my cramped legs...

Last edited by G3P0; 07-11-2011 at 12:06 AM.
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post #5 of 16 (permalink) Old 07-11-2011, 12:13 AM
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Quote:
Originally Posted by G3P0 View Post
new development, it pissed all the coolant out the small breather hole in the bottom of the crank case, oil and water are not mixing, now what... bad or missing seal somewhere? this could have been the culprit as well... looks like I'm going in deeper... maybe water pump seal.
Yup; water pump mechanical seal.

Also, with the age of the bike, I'd go ahead and replace o-rings and the water pump impeller. The new replacement impellers are slightly different, and seem to be more efficient and cool better.

J.D.
Kerrville, TX
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
VROC #16185
GCVROC #33

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post #6 of 16 (permalink) Old 07-12-2011, 12:25 AM Thread Starter
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I pulled the right case cover to find a part not in my service manual, theres a flat washer on the starter gear? (lower right) I couldn't find it in the book, is it supposed to be there?


The pictures in the manual are a bit dark, couldn't make out all the details, is this the mechanical seal for the water pump? the part is pretty chewed up on the inside, like broken graphite.


and this part with the spring, is this part of it as well?


I'm ordering the seals and gasket tomorrow and want to make sure i'm getting all parts needed to make sure the leak is fixed, what do we have here?


85 VN700 Project Bike
Earshave
R/R Relocate
Mustang Seat
Custom grill cover
Busted Engine... removed, split, waiting on parts
Cleaning up & painting the rest

Parts still needed... wanted...
11" shocks, or one stock
Aftermarket exhaust... eventually
Extended forward controls or custom hwy peg mounts for my cramped legs...
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post #7 of 16 (permalink) Old 07-12-2011, 12:03 PM
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Take a look at roaches video here from about the 1-2 minute mark for his removal of the pump seal:
http://www.youtube.com/watch?v=OgpULglm2Y8
That spring and the part behind it are the mechanical seal I believe.
There is an O-ring seal somewhere too I think.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #8 of 16 (permalink) Old 07-12-2011, 01:04 PM Thread Starter
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Thanks Hoss, I was cruzing through these videos looking for that part last night while falling asleep

I think I know what happened, I broke the end off the mechanical seal, the case cover has alot of wear where the impeller seats, not sure if this is going to be an issue, but I think it all began with the clip that holds the impeller shaft in place, you can see in my pic I had the shaft pulled out a few inces, there was no clip holding that thing in there and it slid right out like nothing at all... the impeller was free floating and was chewing at the case cover and the seal wasn't doing its job because it wasn't seated properly... WOW! Looks like I might have to split the case just to put a clip on the shaft... I wasn't expecting to have to do this, but I kinda wanted an excuse... Wonder what else it half-assed in there?


85 VN700 Project Bike
Earshave
R/R Relocate
Mustang Seat
Custom grill cover
Busted Engine... removed, split, waiting on parts
Cleaning up & painting the rest

Parts still needed... wanted...
11" shocks, or one stock
Aftermarket exhaust... eventually
Extended forward controls or custom hwy peg mounts for my cramped legs...
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post #9 of 16 (permalink) Old 07-12-2011, 01:20 PM
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Quote:
Originally Posted by G3P0 View Post
I pulled the right case cover to find a part not in my service manual, theres a flat washer on the starter gear? (lower right) I couldn't find it in the book, is it supposed to be there?


The pictures in the manual are a bit dark, couldn't make out all the details, is this the mechanical seal for the water pump? the part is pretty chewed up on the inside, like broken graphite.


and this part with the spring, is this part of it as well?


I'm ordering the seals and gasket tomorrow and want to make sure i'm getting all parts needed to make sure the leak is fixed, what do we have here?
Mine has that washer, so I hope it's supposed to be there.

Those parts look like the ones on the mechanical seal. I remember there being two indents like the ones on that thicker piece.

Street
1985 VN750 Acquired Feb, 2011 - 13,676km
Mods - Ear Shave, Pickup Coil Gap, Drilled Clutch Basket, Shift Tie Rod, Mosfet R/R, MF Battery, De-Goated (H-Pipe), MCCT, Heated Grips, Plexistar 2 Windshield

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2004 KTM SX 125 - 1979 Can-Am Qualifier 250 - 1971 Kawasaki F6

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post #10 of 16 (permalink) Old 07-12-2011, 09:52 PM
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Quote:
Originally Posted by Roach View Post
Mine has that washer, so I hope it's supposed to be there.
I'd hope so, too. Goes between the starter idle gear limiter and the cover; look in the starter motor section of the parts catalog. Group # is 92022A.

J.D.
Kerrville, TX
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
VROC #16185
GCVROC #33

Photo album: http://www.flickr.com/photos/leekayd/sets
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