Logo
FULL SITE MENU

197835 Evinrude Cracked Block

D

donzi427

New member
"I have a 1978-35 Evinrude. Th

"I have a 1978-35 Evinrude. The engine sat for 9 years unused. Prior to storage it had new coils, wiring, startor motor, cables, etc. The engine had 94 and 100 PSI on the cylinders. I got the motor running. I changed the water pump, head cover gasket and found no thermostat is being used, cleaned the carb etc. The motor ran for 1 hour on 2 separate runs then stalled and would not start. I found water in the bottom cylinder. I removed the cylinder head and found a blown head gasket. With the new head gasket in place the motor has 140 PSI in each cylinder. The motor immediately started and ran for 15 minutes then backfired and stalled. Now it only turns over continously without the plugs installed, but has no signs of water in the cylinders. It still has 140 PSI compression on both cylinders. The motor will only turn over in short bursts with the plugs installed and acts like water lock in the cylinders. There is an oily substance that is coming out of the bottom of the power head. The motor at some point in time looks to have over heated as the green paint is now gold in color- Do I have a cracked block? Where do i look next? Help"
 
"it is highly,.......unlikely,

"it is highly,.......unlikely,u have a cracked blk...but,..it has happened...look elsewhere for the prob's...warped head maybe......."
 
"since u have good comp----whi

"since u have good comp----which,..140,..has me a lil shocked,..however,...go to the carb,spark,..etc.....cooling....new water pump KIT??"
 
"If the lower crank seal is bl

"If the lower crank seal is blown (which could happen if the engine overheated), then you could get water forced up in to the lower crankcase.

Otherwise, make sure the water jacket cover on the port side does not have a blown gasket. In the past, I've seen the aluminum separator plate under the waterjacket plate buckle and corrode."
 
"JWMarine,

Thanx for the i

"JWMarine,

Thanx for the input. You seem shocked that the compression went from blown head gasket compression of 94 and 100 to 140 in both with the new head gasket. Is this too high? What should be normal?

Would too high compression cause the engine to turn over only in 3-5 second bursts and then kick out the startor and act like there is water in the cylinder?

Again the motor turns over fine w/ the plugs not installed.

I cleaned the low speed and high speed jets on the carb.

Installed New Champion spark plugs

Installed New complete water pump kit

Installed new head gasket and head cover gasket.

Installed new lower unit fluid- all clean no water

Does a machine shop need to determine if the head is warped?

Thanx

Brooks"
 
"unless u blow another hd gask

"unless u blow another hd gasket---run it...u can ck the head w/a straight edge ruler.are u still finding wtr in cyl's,w/new hd gasket?"
 
Aluminum castings warp with ti

Aluminum castings warp with time / heat / cooling cycles.I have never seen a cylinder head that was NOT warped after 10 / 15 years use. You can check it with a piece of glass and some emery paper. GUARANTEED it is warped.Manuals tell you to repair / service the head using a piece of glass and paper till it is flat. Simple and easy to do.
 
"The motor will not start. It

"The motor will not start. It has great spark, No water in the cylinders. Will turn over fast without water running from the hose but will not even attempt to start now. Put the motor into water and the startor motor will only turn over for a few revolutions and kick out again as if water is in the cylinders. I take the plugs out and they are coated with a small amount of gas/ no water. I tried to take off the exhaust cover for inspection but the 3 center bolts are stuck. One broke. I drilled and re-tapped. The other 2 can only be done with the power head out of the case if they break so I stopped. I wil inspect the head again and resurface. any other help would be great"
 
"if u are not seeing water in

"if u are not seeing water in cyl's,and on plugs,its not hydro-locking.....u may have a bad starter---bad brushes etc."
 
Back
Top