14749Re: [IH CUB LoBoy Series] Still Need Help with 185
- May 5, 2009Umm not all have a schrader valve.. My old compression tester from the 70's doesn't.. So basically you have to watch it and the valves to know when you're on the compression stroke. But it will show a sticky valve faster as that condition won't allow the tester to fall off as it should. So you need to know what type of tester you have and how to use it.. I agree with the wet test proving rings vs valves. Blown head gasket gets a little tricky as from a compression stand point where the gasket is blown. Cyl to water jacket, Cyl to cyl, Cyl to oil jacket or cyl to outside. Each situation will cause a different reading on the tester.Keep in mind that worn rings usually won't keep an engine from firing. It will stumble a lot but usually will fire. Also a little starting fluid will get you past the does it have spark at a resonable right time.So for troubleshooting purposes make sure you cover the bases first on each before moving to the next. Are you sure you have fuel (air gas mix correct) first. Starting fluid will help answer that. Have you checked spark at each of the plugs. (does the engine sound like it tries to hit? I will say that the compression does seem way low on one of the cyl but don't really know how worn the block, rings and valves are so???Noodle through each of the 3 basic areas to be convinced that all is well before you move on. Troubleshoot to know not guess..Tim S...
--- On Mon, 5/4/09, rez616@... <rez616@...> wrote:
From: rez616@... <rez616@...>
Subject: Re: [IH CUB LoBoy Series] Still Need Help with 185
Date: Monday, May 4, 2009, 9:03 AMAs in any diagnosis, accurate and complete information is needed!!! Also test equipment needs to be in working order and the person doing the testing needs to know how the equipment works. A compression gauge has a schrader valve (like a tire valve) that keeps the pressure stored in the gauge until the operator releases it. A low pressure reading, as stated by Mike could be rings or valve train problem. A wet test will futher determine what is the cause for low compression. A low reading on two cylinders adjacent to each other usually indicates a blown head gasket between the two cylinders. Pressure in the cooling system while cranking and/or coolant in the cylinder is usually a blown head gasket. Rich
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