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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Boxermann on September 12, 2019, 08:31:13 AM

Title: Cam chain problem
Post by: Boxermann on September 12, 2019, 08:31:13 AM

Hi,

So... I've had the header off, and now when I've assembled it I can't turn the engine. I can turn the cams and crankshaft, but as soon as I mount the chain it's stuck after half a turn. What obvious thing have I've missed?

1987 K100

Title: Re: Cam chain problem
Post by: Laitch on September 12, 2019, 09:15:28 AM

Exactly what type of work was done that needed removal of the header? Are you referring to the exhaust manifold, or the cylinder head?

Title: Re: Cam chain problem
Post by: Boxermann on September 12, 2019, 12:47:59 PM

Quote from: Laitch on September 12, 2019, 09:15:28 AM

Exactly what type of work was done that needed removal of the header? Are you referring to the exhaust manifold, or the cylinder head?

Cylinder head. I replaced the head gasket.

Title: Re: Cam chain problem
Post by: Scott_ on September 12, 2019, 01:08:38 PM

From where I sit here in my chair, it sounds like your physical crankshaft/camshaft timing is not correct.

Title: Re: Cam chain problem
Post by: Laitch on September 12, 2019, 01:40:46 PM

As Scott_ indicates, installation of the camshafts without a loads on their cams, camshaft sprocket alignment and agreement of camshaft sprocket alignment with crankshaft alignment are critical. At which fitting are you rotating the crankshaft? With which tool are you rotating it? In which direction are you rotating it? Are the spark plugs installed?

Title: Re: Cam chain problem
Post by: Boxermann on September 12, 2019, 07:07:46 PM

Thanks guys. Yeah, I think I just have to start over. 

Quote from: Laitch on September 12, 2019, 01:40:46 PM

At which fitting are you rotating the crankshaft? With which tool are you rotating it? In which direction are you rotating it? Are the spark plugs installed?

At the ignition rotor flange retaining bolt with an allen key, anticlockwise. Plugs out.

Title: Re: Cam chain problem
Post by: Chaos on September 12, 2019, 09:59:48 PM

hmmm, are K's interference engines?  I don't recall it ever coming up before.