Question about Cars & Trucks
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Posted on Jan 02, 2017
If that low in all cylinders, belt has probably jumped. If that low in just one cylinder, then could be head gasket, valve, etc.
Posted on Jan 16, 2010
This sounds like a classic case of blown head gasket.
You seem to know some about cars, however I will attempt to give you my best answer.
You have a gasket that seals the engine to the head, when you over heat this gasket gets punished and in some cases the head can get warped and the seal between the engine and head is lost resulting in your loss of compression.
You need to remove the head for a better look, take the head to a machine shop and have them check it for warped condition, if so see if it can be machined flat, also look into a rebuilt head, it may just be cheaper to do that then the work to fix your original.
As well your going to have to find the reason the car over heated in the first place..
This might be a good time to see if the car is worth fixing?!
Posted on Dec 29, 2010
cranking compression pressure is 130psi engine hot.
go on line , type in marin.edu and there is a full manual for the engine.
I found it by going google and typing in--- compression pressure for cushman truckster omc engine.
Posted on Feb 08, 2015
Testimonial: "Thanks Bill. I will checkout the web site. Your information was very helpful. Thanks again."
the compression pressures are on the low side. The indications are worn rings as the pressure readings come up when the ring seal is improved with the addition of oil. The bores will be worn in a taper and if the head was to come of there would be a noticeable lip where the top ring stops in the cylinder
rings and cylinders wear equally but rings suffer from a loss of tension, and an increased ring gap that allows more compression to escape to the sump
Do you need to do something about it--
if there is an oil consumption problem( smokey) then yes
If the economy is acceptable to you then --no --not immediately
What should you consider in making a decision----
1. good engines are available from japanese spares ( imported engines with less than 30.000klms on the engine for a fair price
2. consider what is termed a "short motor" which is the block,crank, pistons ,rings,oil pump and sump all new
What you should not consider is a quickie fix--set of rings and nothing else as this will cost you more in the long run.
Posted on Feb 20, 2015
Testimonial: "what do you mean by worn in a taper"
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