What causes DR650 base gasket leak?
Posted September 21, 2007 - 09:17 PM
Thank you all in advance.
Posted September 21, 2007 - 10:28 PM
The only thing that I can think of is that when the piston rod comes in contact with the oil in the sump, it will make big oil splashes inside the engine and introduce air bubbles into the oil; but one will have to grossly overfill the crankcase in order for that to happen. In this scenario, I would expect less oil pressure in the oil lines due to the introduction of air into the system.
Posted September 21, 2007 - 10:34 PM
Unfortunately the pre 2003 have a weak basegasket. Not that they all go leaking, far from it. But it happened too often so Suzuki decided te design a better one.
Posted September 21, 2007 - 10:53 PM
Is the crankcase vented at all?
Posted September 22, 2007 - 06:27 AM
Posted September 22, 2007 - 06:39 AM
Posted September 22, 2007 - 06:53 AM
New gasket technology is using a pressed stainless steel material coated with a heat activated sealer that is tear and break resistant. The sealer remains somewhat flexable and will allow a small amount of movement while still affording a seal. These new gaskets will also fail in certain applications but are much better than anything previously used.
Posted September 23, 2007 - 08:58 AM
Posted September 23, 2007 - 12:22 PM
All this talk of oil pressure, air pressure, etc. is fine, but the bottom line is that if the gasket for the pre 2003 DR650s was any good we wouldn't have the leaks. The new gasket doesn't have the problem regardless of oil level.
But the question was what causes the leak.
My 2001 hasn't leaked yet.
Posted September 23, 2007 - 08:28 PM
I am wondering if it's just an isolated problem for a few of us, or if it's an epidemic for all pre-2003 owners. I have my eyes on my gaskets everyday after reading all the leaking threads on TT.
Sorry, I am hijacking my own thread.
Posted September 23, 2007 - 09:21 PM
fixed with black rtv hi temp.also vented crankcase to atmosphere.
when it gets rebuilt i will get the new gasket.......
see fix in archives MZRATT
Posted September 27, 2007 - 01:12 PM
Posted September 27, 2007 - 01:39 PM
Posted September 28, 2007 - 10:29 AM
Posted September 30, 2007 - 04:38 PM
Posted September 30, 2007 - 05:33 PM
Posted October 01, 2007 - 11:59 AM
Some DR650 owners claim that too much engine oil can cause base gasket leak. I am wondering how the extra oil in the sump can result in an increase in oil pressure to cause the leak. Maybe some of you here who are more mechanically inclined can better explain the reason behind it.
Thank you all in advance.
The weak link in any properly designed engine concerning crankcase pressure is the rubber seals.... not the gaskets. Suzuki just goofed with the cylinder base design on this bike. Either the span is too large between securing bolts or the cylinder casting expands and contracts more than engineers anticipated. That is why they had to come up with a steel base gasket. I have a question though.... I hear the new base gasket is laminated steel. Hopefully they were able to keep the thickness the same as the paper gasket or there goes some of our limited compression ratio. I knew there was a good excuse to install the high comp piston when I get around to fixing the leak.
Posted October 03, 2007 - 03:03 PM