Hi Forum Folks !
I hope this text finds you all Well 👍
1942 BSA WD-M-20.
When I pull Timing Cover, Will there be a retaining Plate to hold the timing gears in place ?
Also. Any cautions/problems with the Oil Feed when doing this that I should be concerned about.
I read in a repair Manual to be cautious of the "Oil Feed Tube" in the cover.
Thank You for your help .
Rich B
Pennsylvania, USA
The timing gear is all held in place by a plate when you remove the cover...Fitted into recesses in the back of the timing cover are two circular rubbers that seal the feed to the cams...These may need replacement if badly distorted...Sometimes they stay in their recesses and come away with the cover, sometimes they may get 'left behind' on the two special bolts that they seal against....
The oil feed into the crank is in the form of a 'quill' or small metal tube that is fixed in the timing cover and protrudes up a hole drilled in the crank main shaft...It doesn't have, or need, any type of seal...This is what can get damaged when the cover is removed, though you have to be pretty heavy handed to do it...The best thing to do is to undo the (9) timing cover screws about 1/4" and then gently tap the cover with a rubber mallet to break the seal...Once that's done remove the screws and pull the cover away from the crank case until the quill clears the crank shaft drilling...
When you replace the cover ensure the oil seals are correctly fitted to their recesses (a little oil or grease will help new ones to engage with the heads of the feed bolts)..Also position the cover so the quill is starting to enter the crank....A couple of screws through the cover and gasket will help to ensure the gasket stays in the correct position...That is important as there is an oil feed hole through the gasket...For that reason I personally don't use sealant on the gasket....Some light grease should be applied to it just to help it stick to the cover in the right position...Replace all the screws until they are started in their threads and then tightened down so that the cover is pulled in evenly and square to the crank case gasket face.....Ian