I’m rebuilding my Fordson Dexta engine (diesel) and need some info on the cylinder liners. I’ve just removed 3 seized pistons and pressed out the cylinder liners. The question is should I use high temp loctite 620 on the new liners when pressing them in. The older liners presumably didnt use it and are a simple press fit. There liner are not flanged.
Cheers,
Peter.

Hi Peter,

To be honest we have never fitted Dexta liners ourselves. Last time we had one done the engine shop pressed in unfinnished liners and then bored and honed them to size (as they distort slightly during the pressing process).
This makes me think that the pre-finnished ones will not be quite as tight-a-fit, so as to minimise distortion. If this is the case then some loctite may be advantageous, particulary if they are not flanged. I cannot see any harm in using the loctite.

PS. If you keep the liners cool it will help minimise distortion when fitting. Also if you have any means of keeping the block warm such as filling the water jacket, or our engine shop put the block in the steam cleaning cabinet to warm it up.

Hi Steve,
Thanks for the advice. I managed to get the new liners in today. I stuck them in the freezer for several hours and let the block sit in the sun for the same. I used the loctite as the liners are unflanged but I can tell you they were a very tight fit in the block. The top end of the liner was so tight it took some extra effort to press them all the way home. This resulted in about 5thou distortion over half an inch from the top so that the pistons wouldn’t fit. I then honed each cylinder liner back until the new piston slid in. Next job is to refit the crank shaft.

I mistakenly took the gear off the camshaft so now I’m worried that I have lost the timing positions. Would you have any advice on how to re-establish the timing positon for the camshaft?

Cheers,
Peter.

Hi Peter,

The Dexta workshop manual is available to download from a website….

http://www.fordson-dexta.de./501255938c0048c14/index.html

Hopefully all the info should be in there.
Sounds like you had some fun with those liners!

Regards,

Steve.

Hi Steve,
Thanks for the link to the manual I’ve downloaded it. Those liners did prove difficult. We actually cracked one about 1/4″ from the top on closer inspection. It runs aroung the circumference for about 1.5″. These liners have a grove milled around the outside, I don’t know what purpose that serves as the old liners don’t have this. This is where the crack emminates.
Looks like I’m going to have to press that one out and try again. I’ll lap out the top of the bore to make things easier on the second try.

Cheers,
Peter.

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