5.7L idles smooth will not get on plane
06-30-2011, 04:23 PM
#11
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We started out the day by verifying that the timing advance was working properly. We then began a compression test and quickly found two cylinders on the fuel pump side of the engine had no compression. All other cylinders had between 150 and 160 psi. I guess the question now is pull the head or pull the motor? There is ample room to get the head off. If by chance the pistons/ cylinders look ok would it make sense to just have the head rebuilt?
06-30-2011, 07:43 PM
#12
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Head gasket it is. Unfortunatley the head and block are missing material where the gasket came apart between cylinders. We will be looking for a replacement engine. Thanks for all the tips.
06-30-2011, 10:13 PM
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Have you checked your fuel pump? Do you have and electric pump or manual diaphram pump? Also check your anti shypon valve at the tank these will stick and cause a very lean condition your engine will literly starve for fuel. Take out your anti syphon valve and put in a straight barbed fitting and try it again. Also tee in a pressure gauge on the inlet side to your carb start it up it shoulld run about 5 to 7 psi then take it out on the water there should be no drop in fuel pressure. There is also a fuel volumn test that you can run during crannk but I dont remember how much fuel should go into a pre mesured container in a minute but if you need to know I can look it up for you.
