MD2030D rocker shaft clearance

K

Kerenza

Well-Known Member
Joined
19 Sep 2011
Messages
416
Location
Newport
www.24bit.ltd.uk
Set about the valve clearances this week, was a little surprised at the sideways movement available for no1. rocker on the end of the shaft.
Engine done 450 hours and like new inside -nothing obviously loose.
Free to move (when valve closed) about 4mm away from the pillar, although I've not actually measured it.

Does it sound correct / typical / normal?

Thanks in anticipation.
 
Would not expect that. Id expect to see something retaining the rocker in position but the parts diagram does not show anything.

There is a screwed plug in the end of the shaft which has a flanged head .... does that retain the rocker and is it loose ?

Compare with the other end.
 
Thanks,
I also expected something similar to the springs for the other rockers / thrust washer etc., but parts list not helpful. Screwed plug is tight, all looks as it left the factory....
What I didn't do was try pushing the whole shaft backwards, if it will move, to see if that made a difference to the clearance.
 
Yes all there, as per the parts list.

It's the clearance at the end of the shaft I was querying, and how much lateral movement is allowed / normal for rocker no. 1.

I'm sure its as it left the factory...., but the possibility of the push rod engaging at a slight angle with the rocker arm when running at speed doesn't seem right.

Perhaps I'm just being too cautious.

M
 
Kerenza said:
Yes all there, as per the parts list.

It's the clearance at the end of the shaft I was querying, and how much lateral movement is allowed / normal for rocker no. 1.

I'm sure its as it left the factory...., but the possibility of the push rod engaging at a slight angle with the rocker arm when running at speed doesn't seem right.

Perhaps I'm just being too cautious.

M
Click to expand...

I agree with your caution the amount of play does not seem correct I see on the W/S manual there is a spring pin that locates in No 1 cylinder rocker arm bracket does this set the

shaft in the correct position , it is not shown on any parts diagram but is listed . Just noticed this pin on Marineparts Europe diagram it is described as clamping pin .
 
Last edited:
Well spotted, although Im not sure it's the answer it will stop me pushing the shaft too hard!

Will be at the boat on the weekend, will repost possibly with a photo and measurement.

Thanks for the interest.

M
 
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