Date: Thu, 21 Jul 2016 23:13:17 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: 1991 Carat - the drama continues
In-Reply-To: <CA+az7_5WTAPhiDEbb+8obx15XPNnhZ7DOet+v=ksYxQ25D74-Q@mail.gmail.com>
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Straight water for testing? Two issues. Now after some run time you need to test the coolant mixture. It is doubtful you got all the water out and the mixture is likely too weak to provide adequate freeze-boil over protection.
More important, fresh, untreated water is loaded with undissolved oxygen. Without the coolant it will also form micro vapor bubbles. Heated this combination will cause corrosion and erosion of the cylinder walls, (luckily they are beefy) and pit the head studs very quickly. I have seen many an engine (even American Iron) destroyed from straight water. It is just a bad practice. Simply pumping the system with some air will be test enough that a hose wasn't left off before filling a cooling system.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Wednesday, July 20, 2016 10:59 PM
To: vanagon@GERRY.VANAGON.COM
Subject: 1991 Carat - the drama continues
Finnaly got the new engine installed, tested and everything seemed to run fine. Water was used for cooling while testing. Drained it out today, dragged out my bong filling devise, and proceeded to fill the system with
50/50 mix of glycol and water. Once filled, I took it out on Interstate 20 eat of birmingham for a test run. Couldn't have asked fo better performance. As I rxited the highway at a cloverleave, my heart sank! As the van slowed the oil light came on with the warning horn. What tne heck!
There was a big grassy area in the cloverleaf, and I coasted to stop out in it. I was puzzled. I waited a few minutes, then started again. Goosed the throttle up a bit, and as the rpm dropped the oil light came on again an the horn sounded. Little bells started ringing. I thought, lets try this again, but take the rpm to 3000 rpm. I started the engine, held at 3000, and the oil lighT DID NOT come on.as I let off on the gas, and as the rpm hit 2200, the alarm sounded and the light came on. Aha, I thought, I've got you now! Dynamic oil pressure fault. Started the engine, held it at idle - no light and alarm. Push the rpm to2000 and held, still no alarm an light.
Increased rpm to 2500, no alarm, no light. Let off on the gas and whenn the rpm dropped to 2200 the light came on and the ala3rm sounded. Definitely that dynamic oil pressure system! Drove it back to the shop at 2000 rpm and under. No problem, no light, no alarm.
Tomorrow it gets a new switch!
Hopefully the vehicle will be ready then for the rest of it's restoration
John
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