Hi All,
Some advice please.
My 53 Conv has 12V71N's with a few hundred hours SMOH. They run well, although a bit smokey.
Question: Port engine keeps popping the dipstick a few inches out of the engine after a a good run. It leaves oil splashes over the ER as you can imagine. At first I thought I had forgotten to replace the dipstick properly, but last time made sure it was properly pushed in. Oil pressure/levels at normal full etc.
Thanks
George
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Thread: Dipstick
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Dipstick
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Re: Dipstick
"DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN
Endless Summer
1967 50c 12/71n DDA 525hp
ex Miss Betsy
owners:
Howard P. Miller 1967-1974
Richard F Hull 1974-1976
Robert J. & R.Scott Smith 1976-present
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Re: Dipstick
I've never had a dipstick blow out. But I would do some investigation before I jumped to any conclusions. Do you have filters on the airbox drains and are they piped into the crankcase vent? If so and the vent is pluged that could pressurise the case. The worst case senario would be stuck or broken rings.
"DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN
Endless Summer
1967 50c 12/71n DDA 525hp
ex Miss Betsy
owners:
Howard P. Miller 1967-1974
Richard F Hull 1974-1976
Robert J. & R.Scott Smith 1976-present
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Re: Dipstick
I think I best call someone who knows more than me. I don't know what I am looking for!
I'll make some calls and try find someone I trust. The best guy for the job lives 4 hours away so wish me luck! The local MTU DD guys are VERY EXPENSIVE, I think they haven't yet realised there is a recession.
Thanks again.
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Re: Dipstick
rsmith is right. I had the same problem with my 453N and a friend of mine told me to check the tube. Mine goes in an old gallong oil jug that is cut in half. I had it sticking into the diaper I had in the bottom. When I make sure it is above the diaper, no more dip stick backing out.
captbuddy
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Re: Dipstick
Check the airbox drainback check valve.
DC
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Re: Dipstick
As always;
Thanks all!
I have spent most the day in the engine room and found what I think you are advising. I found the pipes from the crankcase (two of, one from each side of each engine) and they were fed into a large PVC canister which HAD been full of steel wool pads. I think the problem was caused by me! Surprise huh!
I have cleaned these out after my long trip (300nm) as they had quite a lot of oil in them and cleaned some of the steel wool and replaced the balance with rags.
So: I believe with my last few trips, where I gave the engines a full throttle burst etc. I blocked these breather pipes on the Port engine with too many rags.
Today I again cleaned them out, replaced all the rags with steel wool and have made sure there is plenty of space for the breathers to vent.
Let’s hope I have done no major damage, or blown gaskets or similar. There is good air venting from the pipe when I run in neutral, unfortunately cannot get out to the deep water to give it a test today. Have to wait for High Tide to get out from where she is moored.
Thanks rsmith and all.
Regards.
GLast edited by Jasper; 06-27-2011 at 01:10 AM. Reason: typo
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Re: Dipstick
I wouldnt worry about it 12/n's are pretty bullet proof.
I usualy bring the engines up to full throttle to get the boat on the plane quicker run them at 2300 for a minute then bring them back to 2100. IMO its easier on the engines to get the boat over the hump and cranking along.Last edited by rsmith; 06-27-2011 at 09:47 AM.
"DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN
Endless Summer
1967 50c 12/71n DDA 525hp
ex Miss Betsy
owners:
Howard P. Miller 1967-1974
Richard F Hull 1974-1976
Robert J. & R.Scott Smith 1976-present