Nord engine crank sprocket alignment

Nord engine crank sprocket alignment

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Discussion

fergus

Original Poster:

6,430 posts

274 months

Friday 17th February 2017
quotequote all
I have a 2l Nord engine from an Alfetta which doesn't have the "dots" on the crank and idler sprockets.

The crank sprocket is located via a keyway. What is the criticality with respect to aligning the idler sprocket with the crank sprocket? If this is critical, is there any way around it without having these marks present? I plan on timing the engine from scratch rather than using any 'marks' on the cams or engine if this helps.

rxe

6,700 posts

102 months

Friday 17th February 2017
quotequote all
Haven't needed to time a Nord for a decade but I recall:

- get the engine to TDC on No1 - true TDC defined by the distributor position if the cams are out

- cams need to align with the notches on the cam caps, or whatever method you are using

- put chain on, release the spring loaded idler

- use the verniers on the cam sprockets to allow the cams to align perfectly with a tight chain

- rotate a few times to check everything, tighten the tensioner.

arguti

1,772 posts

185 months

fergus

Original Poster:

6,430 posts

274 months

Friday 17th February 2017
quotequote all
Thanks for the quick replies guys. What are the dots on the crank sprockets for?

Even if you don't know how to measure cam timing, and rely on all the various marks, given the 2:1 ratio in terms of # teeth between the two sprockets, etc, is there anything special about the alignment when using the "dots"?

Mound Dawg

1,915 posts

173 months

Monday 20th February 2017
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No, there's no reason to align the lower ones, the idler is just that so you do the aligning at the top once the head's on.

fergus

Original Poster:

6,430 posts

274 months

Tuesday 21st February 2017
quotequote all
Mound Dawg said:
No, there's no reason to align the lower ones, the idler is just that so you do the aligning at the top once the head's on.
Cheers Jim thumbup