I've got myself a new (used) lovely little sailboat, a Bandholm 24, with a small 13hp Renault (RC16D) engine
lurking in the bilge
, from 1985. I've had it for about 3 months now. When I first did the delivery
sail, we motored for about 10 hours with no issues. Since I've owned it, it's always emitted a small amount of blue smoke, but starts up PERFECTLY every time, with no glowplugs (doesn't even have them) in about 8C weather
. After the 10hour sail, only a very small amount of oil
was consumed, noting too troubling.
After the delivery
sail, I replaced the oil
& filter with new and have been using it very sporadically. Since the oil change
, I ran aground on some sand (embarrassing, but no damage) but I was able to get her free with some serious revving of the engine
in reverse. Since then, I've noticed a gradual "greying" of the oil (definitely not "diesel black" any more) which indicates to me some obvious water
intrusion into the oil. The engine also tends to puke out a pretty embarrassing amount of oil through the cooling water
, very obvious blue sheen on the water behind me.
So, I've decided to replace the head gasket
. The parts
are next to impossible to find but I've been able to source one for 160Ä. I'm quite sure that after my overloading the engine, I've caused the head gasket
to fail. I can also see some oil seeping between the head and the block in some places. I've got the repair
manual and a torque wrench so I'm quite sure I won't **** this up. Due to the raw water cooling
being in very cold water, I'm 99% sure that this engine has never been overheated. It's always just "warm" to the touch.
While I've got the head off, I want to replace the valve guides, and grind the valves. The engine does not have valve guide seals
. My reason is because I think they are leaking oil into the intake/exhaust manifold, through the guides. When I turn the engine over by hand, I can hear a hissing emitting from the intake manifold. I believe this is because enough crap has built up ontop of the valve and is preventing a perfect seal, and there is definitely not perfect compression
(I can turn the engine over by hand if I do it slowly enough, about 4 seconds per cylinder) But because the engine starts perfectly, i'm lead to believe that the fast compression
of the piston forces the valve closed, and the engine can start normally (as it always does.) and therefore the leak is hopefully not past the piston rings. The exhaust
manifold has obvious traces of oil if I jam my finger down it, but it has very little carbon build up.
Just wondering if anyone has any thoughts or tips, or if anyone with more experience things my reasoning is totally off. The engine is cosmetically in very good shape, with the original paint
covering most bolts. I really doubt this engine has been a "mechanic's special" and has just "worked" for all those years, but maybe asking 30 years from a head gasket is too much.
Thanks for the help! I would love to hear any comments!