Help. Upper front cam chain jumped. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
engine or exhaust, discuss it here!

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 04-05-2012, 03:06 PM Thread Starter
Registered User
 
Join Date: Aug 2011
Location: GreenwoodFrickinLakeNY
Posts: 10,354
iTrader: (8)
   
Help. Upper front cam chain jumped.

My upper front cam chain jumped one tooth (was just idling/warming with MCCT lock nut loose so I could adjust). began to chatter a bit, and i noticed the MCCT bolt backing out some. Shut her down immediately.

When both upper cam sprockets are set to where they need to be, the timing line lines up with the "T" in the FT stamp (clockwise of TDC). Guessing retarded then ? Bike runs, no nasty noises, but an occasional backfire into the intake.

Question is : Can I shift the cams/chain over one tooth without removing the head ? The chain loosens some when I back out the MCCT. Is there an easier way to get the chain more loose, w/o pulling the engine and head ?

Thanks in advance.



Wolfie is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 04-05-2012, 04:09 PM
Members who have donated towards server costs
 
JM2001's Avatar
 
Join Date: Mar 2011
Location: Rochester, New York
Posts: 1,803
iTrader: (1)
 
I'd like to help but I don't know the answer. Hopefully you'll get an answer soon. Good luck

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
JM2001 is offline  
post #3 of 17 (permalink) Old 04-05-2012, 04:55 PM
Members who have donated towards server costs
 
denny6006's Avatar
 
Join Date: Mar 2009
Location: InezKY pop.600
Posts: 5,236
iTrader: (9)
     
Garage
Have you got the service manual?If not look up kanuck 69 and down load the online one on here.I would suspect that if it jumped more than one tooth you may have bent a valve.Doesn't sound like it though.

If you down load the manual you will be able to see where the marks should by with each piston where it is supposed to be.

Did the mcct's loosen up enough to allow it to jump or are your cam chains excessively worn,The DOHC Kaws are kinda hard to time with out being able to see everything at once,I hope you can figure out which cam or if both cams moved on ya,or do you think it jumped one tooth on the sprocket driving them.

I hate to hear this happened to ya,but it can be overcame ,although you may have to dig deeper than you want to make sure it's all in time.which I would recommend just to be sure Ihad it right,but you're gonna have to make that call.




If you see it on my bike I did it
VROC#30324
92 vn750(sold)
Current ride 05 1500 Classic FI
lovin' the new scoot



Quote:
"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

Psalm 40:1...
XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
denny6006 is offline  
 
post #4 of 17 (permalink) Old 04-05-2012, 05:37 PM Thread Starter
Registered User
 
Join Date: Aug 2011
Location: GreenwoodFrickinLakeNY
Posts: 10,354
iTrader: (8)
   
I have both the Clymers actual book, and the PDF manual. Still doesnt really tell ya how to set the cams in relation to chain.
Im almost sure I jumped just one tooth on the single intermediate sprocket, as both cam sprockets are "right" in relation to each other.
Condition of sprockets and chain was actually really good considering its an'85 with only 20k on it. Normal wear, but nothing blatantly bad.
Now, I noticed a large bolt head on the head facing the carb where there's supposed to be a spring that pushes on the upper tensioner. Wonder if I removed that, if Id have enough slack in the chain. May as well try, got nothing to lose by doing it.
What I though about doing (since lower chain and intermediate cog is where they should be at TDC) is to set the lower to TDC, then slip the chain away from the cam cogs individually and rotate them to where they should be.
If I gotta pull the motor, I may as well sell it. I cant do it by myself due to physical disabilities.

Gimme back my oil leaking pushrods and rockers !...lol....

Thanks....



Wolfie is offline  
post #5 of 17 (permalink) Old 04-07-2012, 03:33 PM Thread Starter
Registered User
 
Join Date: Aug 2011
Location: GreenwoodFrickinLakeNY
Posts: 10,354
iTrader: (8)
   
Well, I found that the main tension spring(found behind the large bolt in line with carb intake) loosened up my chain significantly. Still kinda tight though. I think mebbe if I remove the front upper chainguide, I can do it....its either that, or remove the cam covers, OR yank the motor, which I cant do.



Wolfie is offline  
post #6 of 17 (permalink) Old 04-07-2012, 05:15 PM
Members who have donated towards server costs
 
Join Date: Nov 2007
Location: Chandler, Arizona
Posts: 2,850
iTrader: (0)
 
The Vulcan 750 motor can be a real PITA to work on, which is why I often complain about it's complexity. I see no reason why it needs 4 cam chains instead of 2, like all other Japanese v-twins (with the single exception of the Suzuki TL1000) The Vulcan 800 only has 2 cam chains, and so does the Suzuki Intruder, which is just a hair faster than the Vulcan, so it was not for performance. Watch Roaches videos. I believe that to get it timed right, you have to pull the heads and count links.

The motor is not all that hard to get out, you don't have to lift anything. Just put a transmission jack or something similar under it, remove the right frame section, remove the engine mount bolts, and wiggle it out of the frame. The hard part, or at least the most time consuming, is disconnecting and removing all the stuff that attaches to the engine.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike

Last edited by VN750Rider/Jerry; 04-07-2012 at 05:18 PM.
VN750Rider/Jerry is offline  
post #7 of 17 (permalink) Old 04-11-2012, 03:58 PM Thread Starter
Registered User
 
Join Date: Aug 2011
Location: GreenwoodFrickinLakeNY
Posts: 10,354
iTrader: (8)
   
Gonna try to pull the cam cover off first, and see if I can slip the chain one tooth then. If that dont work, gonna need to yank the engine, and gonna need to wait for summer for that (too cold in the garage). Sucks too, because supposed to be almost 80 on Monday.
May as well do the clutch at same time then too. Stator and R/R has been done.




Last edited by Wolfie; 04-11-2012 at 04:01 PM.
Wolfie is offline  
post #8 of 17 (permalink) Old 04-13-2012, 06:46 PM Thread Starter
Registered User
 
Join Date: Aug 2011
Location: GreenwoodFrickinLakeNY
Posts: 10,354
iTrader: (8)
   
Fixed the sucker !...loosened up/removed the 2 upper tensioners (MCCT and main), set the cam cogs at TDC, stuck punches in the holes to lock em in, then jiggled the rotor back and forth until it jumped the intermediate gear back to where it was. Took a 20 mi ride, and all was cool. Whew ! Not dead in the water after all !



Wolfie is offline  
post #9 of 17 (permalink) Old 04-14-2012, 01:20 AM
1986 VN750
 
thtanner's Avatar
 
Join Date: Nov 2011
Location: Dana Point, CA
Posts: 3,255
iTrader: (8)
 
Garage
Quote:
Originally Posted by Wolfie View Post
Fixed the sucker !...loosened up/removed the 2 upper tensioners (MCCT and main), set the cam cogs at TDC, stuck punches in the holes to lock em in, then jiggled the rotor back and forth until it jumped the intermediate gear back to where it was. Took a 20 mi ride, and all was cool. Whew ! Not dead in the water after all !
Awesome to hear! Helpful information as well..

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
thtanner is offline  
post #10 of 17 (permalink) Old 04-14-2012, 10:02 AM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,878
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
good to hear,man

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome