900 timing chain tensioner - Take 3 -SORTED!
#1
Posted 10 April 2007 - 10:23 pm
Secondly - I've got the 900 one to work. There's a HUGE difference in the spring tension of the plunger between the 850 and 900 - the 850 is a ratchet type with a strong spring and the 900 a worm and nut type with a very weak spring (well mine was)
I don't have a diagram of pic so it's best to PM me and I'll give you my phone number to talk through it but the 900 has a "Slinky" type of coil spring, if that makes sense, the kind of action you'd get in a clockwork toy. I basically dismantled the tensioner assembly and rebuilt it with a couple of more turns of tension, much like winding a clockwork toy up just that bit more (I realise some of the yoof on here won't have a fuckin' clue what I'm on about talking about clockwork )
This gives the plunger some more pressure on the chain tensioner blade and so far (fingers crossed) and 50 miles later there isn't a noise from it Seems to me that this is a Yamaha production assembly fault even though Yamaha UK have only replace two TDM900 tensioners under warranty
To determine TDC firing on the left cylinder - and without having to take the camcover off (again ) you can remove the cylinder identification sensor out on the top left of the cam cover (this picks up a signal to tell the ECU the left cylinder is firing) and put your little finger down onto the camshaft. Turning the crankshaft in the anticlock (forward) direction you will feel a raised part on the exhaust cam as TDC is approaching - then turn the crank 1 FULL TURN from there and that's the left cylinder firing. I also removed the right spark plug to feel compression to back up this theory/practice but the cam sensor method works
1967 Yamaha TD1C 250, 2014 Kawasaki W800, 2011 Aprilia Tuono 1000 V4, 2020 Yamaha XSR900
"At the cutting edge of technophobia"
#2
Posted 10 April 2007 - 10:29 pm
Secondly - I've got the 900 one to work. There's a HUGE difference in the spring tension of the plunger between the 850 and 900 - the 850 is a ratchet type with a strong spring and the 900 a worm and nut type with a very weak spring (well mine was)
I don't have a diagram of pic so it's best to PM me and I'll give you my phone number to talk through it but the 900 has a "Slinky" type of coil spring, if that makes sense, the kind of action you'd get in a clockwork toy. I basically dismantled the tensioner assembly and rebuilt it with a couple of more turns of tension, much like winding a clockwork toy up just that bit more (I realise some of the yoof on here won't have a fuckin' clue what I'm on about talking about clockwork )
This gives the plunger some more pressure on the chain tensioner blade and so far (fingers crossed) and 50 miles later there isn't a noise from it Seems to me that this is a Yamaha production assembly fault even though Yamaha UK have only replace two TDM900 tensioners under warranty
To determine TDC firing on the left cylinder - and without having to take the camcover off (again ) you can remove the cylinder identification sensor out on the top left of the cam cover (this picks up a signal to tell the ECU the left cylinder is firing) and put your little finger down onto the camshaft. Turning the crankshaft in the anticlock (forward) direction you will feel a raised part on the exhaust cam as TDC is approaching - then turn the crank 1 FULL TURN from there and that's the left cylinder firing. I also removed the right spark plug to feel compression to back up this theory/practice but the cam sensor method works
well done mate if i get a minute tomorrow Alan i will give you a ring for the Techy details. (p.s. i must be old i know what clockwork is )
cheers
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#3
Posted 11 April 2007 - 12:55 am
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#4
Posted 11 April 2007 - 08:55 am
As I've said to you before - in life, there's those who can.........and those who can't
caaaaaaaaant!
1967 Yamaha TD1C 250, 2014 Kawasaki W800, 2011 Aprilia Tuono 1000 V4, 2020 Yamaha XSR900
"At the cutting edge of technophobia"
#5 Guest_Emmett_*
Posted 11 April 2007 - 10:42 am
#6
Posted 11 April 2007 - 12:53 pm
He also managed to squeeze in "plunger". ohh err
#7
Posted 12 April 2007 - 11:12 am
Ummmmm....... I'm confused!
You say "you will feel a raised part on the exhaust cam as TDC is approaching - then turn the crank 1 FULL TURN from there and that's the left cylinder firing". But surely if you can feel the lobe of the cam rising, that means the exhaust valve is closed and you are on the compression stroke immediately prior to firing. If you turn the crankshaft 1 FULL TURN more, the exhaust valve will be open and you will be on the exhaust stroke.
Seeya
David
#8
Posted 12 April 2007 - 12:25 pm
Hope that clears it up
1967 Yamaha TD1C 250, 2014 Kawasaki W800, 2011 Aprilia Tuono 1000 V4, 2020 Yamaha XSR900
"At the cutting edge of technophobia"
#9
Posted 05 August 2018 - 08:55 am
Sorry to confuse you Saxo, and any others................it's the portion of the exhaust camshaft which the sensor picks up from that you're feeling. You would initially think that the "raised" bit would be the sensor pickup BUT it's not! another 360 deg. of crank and the left cylinder is at the end of compression
Hope that clears it up
Alan, does 'at the end of compression' mean TDC ?
spyball alarm/immob, bluespot brake calipers and Stainless hoses, Fournales air adjustable shock with Remote Resevoir, forks raised 10mm thru yokes, racetech linear fork springs in 15 wt oil, Kappa wingrack/luggage, heated grips, Kedo handguards, dual heat controller to power heated jacket liner and or pants!!, Stebel 136DB horn, K&N air filter, colour matched Baglux tank cover (magnetic tank bag modified to fit cover), osram +50% headloight bulbs, headlight protector,"NitramSpecial" parking loight, tail light indicators all running on LED's & incorporate "Lite Buddies", MK7 Scottoiler fitted, taller screen, 2-2 stainless steel CCC's, Devil stainless down pipes. MKI Renntec engine crash bars & sump guard.
engine changed july 2007 on a dyno run it made 79.1BHP / Torque 59.9Had a brief flirtation with a 1999 MKIIa but it blew an exaust valve on the M5 so was sold on to be repaired.
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#10
Posted 05 August 2018 - 04:08 pm
G'day Alan,
Ummmmm....... I'm confused!
You say "you will feel a raised part on the exhaust cam as TDC is approaching - then turn the crank 1 FULL TURN from there and that's the left cylinder firing". But surely if you can feel the lobe of the cam rising, that means the exhaust valve is closed and you are on the compression stroke immediately prior to firing. If you turn the crankshaft 1 FULL TURN more, the exhaust valve will be open and you will be on the exhaust stroke.
Seeya
David
The cam sensor doesn't look at cam lobes, instead there is a separate cast raised mound on the camshaft away from the lobes which the sensor is reading
900 with better bits. Owes me nothing, Makes me smile
#12
Posted 06 August 2018 - 01:44 am
Yes
wank yew very crutch.
spyball alarm/immob, bluespot brake calipers and Stainless hoses, Fournales air adjustable shock with Remote Resevoir, forks raised 10mm thru yokes, racetech linear fork springs in 15 wt oil, Kappa wingrack/luggage, heated grips, Kedo handguards, dual heat controller to power heated jacket liner and or pants!!, Stebel 136DB horn, K&N air filter, colour matched Baglux tank cover (magnetic tank bag modified to fit cover), osram +50% headloight bulbs, headlight protector,"NitramSpecial" parking loight, tail light indicators all running on LED's & incorporate "Lite Buddies", MK7 Scottoiler fitted, taller screen, 2-2 stainless steel CCC's, Devil stainless down pipes. MKI Renntec engine crash bars & sump guard.
engine changed july 2007 on a dyno run it made 79.1BHP / Torque 59.9Had a brief flirtation with a 1999 MKIIa but it blew an exaust valve on the M5 so was sold on to be repaired.
I loike tay and hang sangwiches !
www.kenhogantreeservices.co.uk
http://s33.photobuck...77/wickla/?sc=6
http://reg.imageshack.us/v_images.php
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