weeping rocker box- 18S

1608 · Post by **1608** » Thu Mar 01, 2012 4:00 pm

Had a leaky rocker box for some time now. I'm pretty sure the joint is quite sound, is this an indication of crank case pressure possibly due to blow by because of either bore wear or broken ring.The crank case breather also drips a little. Both the above symptoms have increased over time and engine is not as quiet as it used to be.Suppose I've answered my own question, grateful for any observations though.
Thanks

Rob Harknett · Post by **Rob Harknett** » Thu Mar 01, 2012 4:17 pm

could had been push rod tube rubbers, flattenred tappet cover seal or not fibre washers under acorn nuts. I would nto worry too much about the breather driping. I've had that with the bikes when new or nearly new.

1608 · Post by **1608** » Thu Mar 01, 2012 4:28 pm

Thanks Rob, but I'm referring to the actual rocker box not the tappet inspection cover. Definitely nil to do with push rod tubes.

laxy · Post by **laxy** » Thu Mar 01, 2012 11:27 pm

Rocker cover bolts dont need to be as tight as you can get them.Its the gasket that makes the seal.Overtightening can cause warping so you may need to remove the cover and get a local engineering shop to check its flat and skim as necessary or have a go yourself with a sheet of plate glass,although you will need a lot of patience to do it that way

wilko · Post by **wilko** » Fri Mar 02, 2012 7:28 pm

Nothing like a good cuddle for a weepy rockerbox!