Hello, I work at a small boatyard and recently acquired a pair of 41 series Volvos in a boat. The boat had sunk and remained in the yard for several months before I got my hands on it. i managed to get one engine
freely turning, but not so much with the other.
Currently I can rock it back and forth a couple millimeters by the flywheel. After 10 days of sitting with liquid wrench / PB Blaster / Knock-off it hasn't improved or noticably gotten worse. Well, I want this thing to go !
At this point I have two ideas that I gathered from the internet
. One is to drain all the coolant
and replace with boiling water
. Sounds like a good idea. The other is to pour hot engine oil
down into the cylinders. I think I want to make the cylinder expand, rather than the piston, but it is an easier task and the desired result is to break up the corrosion
holding the piston rings.
Failing that I am faced with a more difficult job. At the end of it all I have a 10 ton forklift with a 20 foot extension boom, just for these kinds of tasks, but I am not sure I want to draw on that resource quite yet. The idea with this being to remove the oil
pan and try to knock the pistons free using a brass bar on the crank.
Pulling the head
is why I am posting
this though. I have some questions.
- When pulling the head
I start with the last bolt in the tightening sequence (#26) and work incrementally towards #1 ?
- Is my initial un - torquing done with the 90 degree turn and then in following 4 steps of loosening it ? Much like when I torque it ?
- When I get the thing off, is there any way to ascertain which cylinder is the one frozen up ? I can look at the valves and see which ones were open, or I can try to get a thin piece of metal down the side and see which rings move ?
I am going to get the machine shop to make me a wooden plug
to hammer on and hopefully that, and a crowbar on the flywheel will break it free. When I'm rich I can redo the job correctly, but for now it's just important to me to have a working boat, and not a limper.
Any ideas would be appreciated. Thanks !