The camshaft is abrased

(Tips of repair at the end of this page ) 

A main point of weakness of the XL motor is the  sliding bearing of the camshaft in the cylinder head.

Without bearing bushes the camshaft runs on aluminium of the cylinder head.

On motors with a lot of kilometers  a wear out of the bearing surfaces of the cylinder head is recognizable.  But also the camshaft can show clear signs of abrasion too.

Values of the service manual :

Theoretical value:         - bearing pin outside diameter - righthand side = 36,431 mm

Theoretical value:         - bearing pin outside diameter - left hand side   = 36,466 mm

Wear and tear value:    - bearing pin outside diameter - righthand side = 36,230 mm

Wear and tear value:    - bearing pin outside diameter - left hand side    = 36,270 mm

In both cases a repair is not possible ( on my knowledge )  and an exchange of the concerning parts is necessary. Thereby the camshaft  is the less expensive part.

Here are two photos of a new and unused camshaft: ( klick on the photos to enlarge them )

Clear to see, the plain und undamaged bearing surfaces on the right and on the left hand side.

Concerning this theme following mail reached me:

 21.12.99  Hello Volker!

Another short story:

During my reconstruction I met a pretended as widespreaded suffering of the XL.
The sliding bearing of the camshaft showed abrasion.

Look at the pictures:  (klick on the photos to enlarge them)

  

For repairing following low cost solution was found:

Grinding the abrased camshaft  und afterwards nitrating the camshaft.
The worn out bearing surface of the cylinderhead must be welded up and must afterwards be eroded down to the new value.
Costs  about 300 Euro. (All parts together about 800 Euro)

If required, I have contact adresses of german companies, which can realise these repairs.

Best regards

Heinz Langbauer