OutdoorKing Repair Forum Forums Restoring, Customising and Modifying Tech Talk GV150 tuneup help needed

There is no problem, roebuck, you are getting the job done, and learning without breaking anything or hurting anyone.

An oil seal is usually described by three dimensions: interior diameter, exterior diameter, and width. Honda says the top crankshaft seal is 21x41x6. That means they think they made the crankshaft to fit a top oil seal with an interior diameter of 21 mm. It would appear that you have been sold 25 mm oil seals up to now, so the diameter of the sealing lip was 4 mm larger than the shaft it runs on. Because that engine has a pressure lubrication system, and one of its purposes is to lubricate the ballrace at the top of the crankshaft, having effectively no oil seal behind that ballrace would inevitably result in rather a lot of oil ending up on your breaker points. Up to now I'd been wondering how you were getting as much oil as you reported - even a sick and sorry oil seal would only ooze a bit, and you were talking about a lot more oil than that. Now it all becomes clear.

Just for interest, here is the assembly diagram for the crankshaft:

As you can see, the oil seal goes in from the top of the crankcase casting, and the ballrace goes in from underneath. The crankshaft must have a step-up in diameter just behind where the oil seal runs on it, because its ballrace is a 6205, which has an internal diameter of 25 mm and an external diameter of 52 mm.

Post edit: As will become clear later in this thread, the Honda workshop manual turns out to be incorrect. The correct seal for this engine is 25x41x6.

With regard to posting pictures, if you look at the box you type your post in, right above it is a row of colourful icons. The fifth one from the left looks rather like a paint spray can with a blue upward arrow in the top right corner - I've circled it in red here:


If you select that icon, you will see this:


Stab the browse button, and you will see whatever file directory in your computer you looked at last. Navigate to where you put the pictures you want to upload, and double-click the first one. Its location will then appear to the left of the browse button. Jab the "Add file from your PC" button. There will be a little animated picture with red diagonals sliding across it for a while, then a thumbnail of the picture will appear in the top left corner of the box. Punch the "All done" button on the bottom right. You will then be back in the typing box, posting your message.