The water never sat in the cylinder for a long time! Boat was winterized with clean oil. Then I ran it on muffs not knowing the out drive impeller is gone so engine overheated. Then took it to the lake and got milky oil. Right after that (like within days) I began the head service. There was no...
That’s true! These engines don’t seem to have a good reputation. What happens if my only issue is lower compression in 1 cylinder and I just leave it as it is?
I did the pushrod roll test and they were all straight. Head is machined and block surface was tested by a flat edge and it was flat and marine grade head gasket is installed. It’s just lower compression on cylinder 4.
As I said I got 150psi compression when put some oil in the cylinder 4! Manual says if that happens valves r fine and most likely it’s the piston rings! I just want to know if there are other causes beside the possible ring issue
I showed to a mechanic and he measured the new one and old one and said the new one is slightly shorter but within the margin! Like I said to a naked eye it looked like about 1/32” shorter. I didn’t do the valve lash adjustment. Just put all the pushrods in the order I took them out
I had water in oil of my Merc 470. After some diagnosis and tests decided to change the head gasket and service the head. Machine shop resurfaced the head, and said no crack or other issues found. Put the head back on with a new marine head gasket (put Sierra gasket not Merc!). Had a little...
I am in the process of servicing my Merc 470s head. Got the head back from the machine shop where they tested it for crack and resurfaced it. Installed the head as per service manual. My question is do I have to adjust the valve lash since I disassembled the rocker arms and push rods? or in...
Buying a new manifold wouldn’t make economical sense to me! It’s about 2 grand! Specially when other than that little corrosion my manifold is in great shape.
I’ll call more weld shops and radiator repair shops thou.
But check out this High heat JB weld, they claim it is good for up too 2400...
Hi
I am in process of servicing the head on my Mercruiser 470 and consequently had to remove the exhaust manifold which is an aluminum type. Once out, I found some corrosion on the port number 4 of the manifold. Basically after sanding the corroded flakes, now less than half of the diameter of...
Head is back from the machine shop. They said it had no crack or other damage but had a little warp which was fixed with resurfacing. I got all the gaskets too. Is there anything I should do (test, repair, etc.) before the assembly? Also any particular tricks of trade for this head assembly...
The weep hole wasn't leaking. I pushed a paper clip in the weep hole to make sure it is not plugged, it went in for about a couple of inches or so, still no leakage when engine was running. Based on this can I conclude that water in oil is not from failed camshaft seals?
I’m sending the head to the machine shop to do what machine shops do with heads, machining, pressure testing, check for warps etc. is that the correct way To deal with this issue?
I did a rad pressure test before taking down the riser and manifold. Pumped 15psi, it dropped to 14psi almost immediately, then stayed there for about an hour that I had the tester on.
Then I did another cooling system pressure test with riser and manifold off ( blocked hoses) this time It was...
Hi everyone
I am in a Merc 470 water in oil situation. I get water or coolant (not sure yet) when running engine on muffs. Since I knew at least one case of engine overheat event had taken place, I decided to service the head anyway. Can someone have a look at the attached 2 photos of the head...
Just to make sure my riser doesn't have internal leak... when i pour water through the seawater intake of the riser (the short tube on the side) water flows to the exhaust chamber of the riser. I am guessing when the part is installed that's how the seawater exits the system. This is how riser...
