[928uk] Timing belts and 45 degrees

[Kevin Fearon]

Just a thought: wouldn't a motorcycle timing disc help with this?
https://www.ebay.co.uk/itm/005098-MOTORCYCLE-BIKE-ENGINE-CAM-IGNITION-TIMING-DEGREE-DISC-TRIUMPH-BSA-NORTON/273604084220?epid=530876241&hash=item3fb41301fc:g:MRQAAMXQJRhRa7K1
Kindest regards,
Kevin 

    On Monday, 9 September 2019, 19:34:54 BST, Stephen Sheridan via 928uk <928uk at lists.928.org.uk> wrote:  
 
 Great idea using the existing markings to measure. I’m taking my time with this job, I’ll double check the teeth are properly engaged! 
Regarding the fuel line, I loosened the master cylinder and it gave me just enough room to get two wrenches tightly on the two connectors. Still won’t budge, it’s like it’s welded. I’m tempted to just cut the hard line underneath and put a join in there. 


On Mon 9 Sep 2019 at 18:29, Paul Lacey <t595 at btinternet.com> wrote:

Measure the spacing between 0 5 and 10 you should be able to make your own marks for 45 degrees !But you need to make marks on the old sprockets before you remove them and copy onto new sprockets.Fortunately it’s much easier to change your sprockets than a 32v engine as the valve timing isn’t adjustable.One thing though is you might find the locking tool doesn’t engage properly at your calculated 45 point, you might need a tiny movement to get the teeth fully engaged, but make sure they are because if it suddenly jumps teeth when you have a lot of pressure on torque wrench it could be a brown trouser moment :-)

Best Regards,Paul L
Sent from mobile device, please excuse typos
On 9 Sep 2019, at 17:37, Stephen Sheridan <sphoto.ie at gmail.com> wrote:


Thanks guys,My balancer only has 5 and 10 markings. If I just picked a spot roughly 45 degrees around the balancer I’m assuming that would be ok. I have to replace the cam sprockets so it’s likely the cams will move. On a side note I’m also replacing all the fuel lines, has anyone any tips for removing the main flexi line, trying to get tools tight on the coupling and room to move them is a nightmare. The intake is all stripped off but it’s still really tight there. Thanks,Steve. 1985 S2 auto. 
On Mon 9 Sep 2019 at 17:26, Paul Lacey <t595 at btinternet.com> wrote:

Paul is spot on except there’s no timing mark for 45 on a pre-S4 harmonic balancer (front pulley) but 20 degrees is there. I usually swap belt with crank locked on the 20 degree mark as this gives some safety although I wouldn’t try turning cams.You will need to make (or photo) your own 20 degree marks on cam sprockets 

Best Regards,Paul L

Sent from mobile device, please excuse typos
On 9 Sep 2019, at 16:33, Paul <ukkid35 at gmail.com> wrote:



When the crank is at 45 BTDC, with a 90deg V, no piston is at TDC
That means with the crank locked at 45 BTDC you can safely spin the cams, because the maximum lift is half an inch, so no possibility of hitting a piston
Only the early 16v cars, 4.5 for sure, are non-interference, the S2 can definitely be damaged if a belt lets go
Therefore I would highly recommend changing at 45 BTDC on an S2 as well, however I've no experience of working on a 16v so others will be far more knowledgeable
Paul87 S4 Manual
On Mon, 9 Sep 2019 at 16:13, Stephen Sheridan via 928uk <928uk at lists.928.org.uk> wrote:

Hi all,I’m just getting my timing belt off and I’ve been reading that some suggest the timing should be set to 45 BTDC before taking the belt off. Is this just for 32v cars? Regards,Steve. 1985 S2 Auto. 




  
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