mercruiser 3.0 wont start, Head issues??

[sledstew]

Hello,
Got a 3.0 Mercruiser that we are trying to get running and here is what we have done.

Checked spark- good

checked timing-good

checked compression- cylinders seemed dry so we squirted oil in each cylinder and compression is at roughly 100 on each cylinder

Did a blowdown test- seemed real good

Plugs are good

Cleaned carb and replaced with full kit

The issue we seem to be having: The #2 and #3 cylinders seem to be getting fuel but the #1 and #4 cylinder do not seem to be getting fuel. I can see oil sitting on top of the #1 cylinder (since we squirted it in cylinder) but it will not blow it out the plug hole when you crank it over with the plugs out. I can see the lifters moving on that cylinder so I know the cam is ok (somewhat) , Is it possible the intake valve is stuck closed?? Kind of a weird senario, thought I would post here and see if anyone has had a similar problem. I know these engines are weak at around 100 psi,but it should still run at that.

The other odd thing I noticed is that it looks like the #1 and #4 piston isnt coming fully to top dead center like #2 & #4, could it be a bad crank??

Any input is appreciated.

 

[Chobes]

Re: mercruiser 3.0 wont start, Head issues??

Very Odd! Personally I would recheck the torques on the Rocker arms. Sounds like one of your valves is sticking open! Did you torque them with the #1 cylinder at TDC??? then tighten #1 Intake and Exhaust rockers, #2 Intake, #3 Exhaust, #4 Intake, Spin crank one full revolution and your distributor should be pointing at #4 plug wire. Then tighten #2 Exhaust, #3 Intake, #4 Exhaust. I didn't use a torque wrench, Just tightened until the up down play in the pushrod was gone and went 1 full turn after that.

Forgot to mention that you should do this on the Compression stroke of Piston #1.

Are you getting any fire at all?? Back fire, anything??

 

[sledstew]

Re: mercruiser 3.0 wont start, Head issues??

No backfire,nothing at all. We checked that already (the stuff you mentioned) any other suggestions?? Thanks for the input