cylinder out of round.. nklr

[Rick McCauley]

Cylinders can also be out of round right out of the factory. Don't think for a moment that everything that comes out new is perfect. My Father-in-Law bought a brand new Mustang II back in 75, if memory serves. It sucked oil from day one. After several visits to the garage and calls to Ford, the engine was disassembled and one cylinder was oval shaped. As Jeff said we are talking a few ten thousands of an inch, but that is all it takes. Ford replaced the engine. Well, actually a new short block, not the entire engine. All was well after that. Rick A17

--- On Thu, 4/9/09, Jeff Saline wrote: From: Jeff Saline Subject: [DSN_KLR650] Re: Cylinder out of round... To: DSN_klr650@yahoogroups.com Date: Thursday, April 9, 2009, 8:15 AM Listers, I think you'll find the cylinders of all engines will tend to go out of round after a bit of usage. The orientation/ movement of the piston and piston pin will have a small effect on the wear of the cylinder. Also with the stock coolant system design on the KLR the coolant enters one side of the cylinder and then flows up and around to get to the head. The coolant in the cylinder is warm to hot and then coolant entering the cylinder on a stock system is maybe 80 degrees cooler. That thermal shock will cause some movement in the size of the cylinder. This is where a Thermo-Bob can make a pretty nice difference. Without a precise measurement of the cylinder I doubt you'll be able to tell the cylinder is out of round. We're probably only talking about 0.002"-0.003" difference on a well worn cylinder. But that is enough to cause oil use issues. I've got a 2005 cylinder on the bench right now and I'll try to remember to measure it today if I get time and check it for taper and out of round. I'll also try to measure the piston so there is a comparison of piston to cylinder clearance for both x and y. Best, Jeff Saline ABC # 4412 South Dakota Airmarshal Airheads Beemer Club www.airheads. org The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650, 79 R100RT . ____________ _________ _________ _________ _________ _________ _ Looking for foreclosures? Click now to take advantage of today's housing market. http://thirdpartyof fers.juno. com/TGL2141/ fc/BLSrjpTQyL1m3 4JIR70KSOdBolmnb Ij6aROkFEyGgtFqz mIOmeNu7tcc8dK/ [Non-text portions of this message have been removed]