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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
Check the breather tube that goes up to the intakes is clear. Pull the stick and put your finger over the tube to see if you have blow by pressurising the crank case.Quote:
Originally Posted by Jasper
Quote:
Originally Posted by rsmith
Thanks rsmith. Will try to find this by using the manual. I am not very mechanically minded!
Can this cause a major problem?
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.
Quote:
Originally Posted by rsmith
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.
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
Check the airbox drainback check valve.
DC
Quote:
Originally Posted by DLCameron2
I think the checkvalves are only on TI's he has N's. I have my vents going into milkjugs also. I was always going to pipe the drains into the breather tubes untill I Cleaned out the airboxes when I RB the engines and saw the amount of sand and mud I dug out of all the nooks and crannies of the boxes.I didnt think sending any of that thru the engines for a second time was a good idea.
Quote:
Originally Posted by rsmith
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.
G
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.
Quote:
Originally Posted by rsmith
Well I will find out this weekend, we are going whale watching a few mikes offshore.
The engines are still using a lot of oil from what I am used to.
Only 208 hours on each so far. Very smokey when I take her to 2300 then they settle back and at 2000 are okay, but still show some smoke.
This is the oil I've used in my 12's for 35 years and near 10,000 hours. I have friends in the mining industry and trucking industries that swear by it. I buy it by the 55 gal drum.
http://www.le-international.com/prod...lay.aspx?id=54
Quote:
Originally Posted by rsmith
Hi rsmith,
I assume from the product sheet that you are using the #8440 which is 40W?
I have found 40W from the MTU DD dealer here. For the trip from the cargo ship to home I could only find high quality multigrade 30W/50W until I got halfway and found a trawler supplier who had 40W.
Routing the airbox drains to the crankcase breather outlet at the air intakes is not recommended by DD, they have concerns re, potential run away..
Quote:
Originally Posted by Jasper
Yes the 8440 is what I use.
"My 53 Conv has 12V71N's with a few hundred hours SMOH. They run well, although a bit smokey."
After "overhaul" smoky is not what you should expect....
that covers a wide range of possible work.....What did the overhaul entail?? Maybe the injectors need to be checked....??
Quote:
Originally Posted by REBrueckner
Well that is news to me!
I was told that until the "new" OH engines settle in, they use a bit more oil and smoke a bit more. They Smoke only when I rev them up and then settle down ok, although even at cruise I still see some smoke, more than I am used to after having boats with Cummins and MAN engines.
As for the OH, I have the invoice from Piedmont Engineering for close to $40,000 NOT including taking the old engines out or installing the Overhauled ones.
The engine surveyor gave me a TOP report and we even checked the pistons and found them to be new, DD parts with all the right markings etc.
Your thoughts?
Thanks and Cheers
If your talking about the smoke haze behind the boat that you need to look at the horizion to see, thats just the way it is with the garbage fuel we get today.
what rsmith said...plus "They Smoke only when I rev them up and then settle down .." If that's a quick increase in throttle and RPM under load it's probably normal.
I don't personally think that's ever a good idea especially if the engine is not warmed up; on the other hand the commercial lobster boat owners sure don't baby their engines.
Quote:
Originally Posted by rsmith
Really because I have no haze at all ZERO!
But I do agree with the fuel has gone down hill BIG time. But I have no haze at all so can't be the fuel.
When we go to the Bahamas and get that nice, clear as gin fuel there is no haze after the first couple loads. From what I remember of NY the whole place is nothing but brown haze you need to come down to the fresh air and sunshine to see it.LOL
It doesnt show too much here, but theres a slight SO2 haze about a mile back. This is at 1400 rpm... ws
http://i51.tinypic.com/5z4bav.jpg
SO2, Sulfur dioxide, is a colorless gas. You can't see it. Your haze has some other stuff in it.
Bob
Quote:
Originally Posted by yachtsmanbill
that looks like gasser Roamer wake to me!!!
NOPE!! Thats a pair of tired 12-71s off Biloxi... Us big guys just run at hull speed... no need to rush out to the canyons for the tournaments!
SO2 in itself is odorless and colorless, but when viewed in concentration from a distance, it and the impurities carried along produce that light brown/gray haze... Look at a powerplant discharge from 20 miles away on a still day... Probably the UV affecting the visibility (?). ws
http://i56.tinypic.com/28jzno6.jpg
http://i54.tinypic.com/w6728.jpg
http://i53.tinypic.com/f3gh1d.jpg
First non paying passenger!
Small carbon footprint... wsQuote:
Originally Posted by rsmith
http://i54.tinypic.com/2vnh100.jpg
Be careful! They're not poisonous, but if the little bastard tries to sell you insurance, watch out!Quote:
Originally Posted by yachtsmanbill
I called them animals about insurance and they laughed when I told them its for a 58 foot Hatteras! ws
LOLQuote:
Originally Posted by rsmith
Well there is no haze 100 miles offshore with a south breeze and still no haze :)
Got to do better than that ;)
But I have too say I do use a good additive !
But that should not matter because its snake OIL.
Quote:
Originally Posted by 34Hatt
I dont know. Scrod does your injectors?
Actually, in many cases it is the fuel. We've had a couple of techs from the local Volvo dealer tell us that Stanadyne Performance formula has cured transom sooting for some of their customers. 34Hatt, OTOH, sells his own snake oil. I think he mixes it in his bathtub. ;)
Quote:
Originally Posted by yachtsmanbill
Great photos yachtsman!!!
I get so many differnt opinions, so I go with the guys who have done many naut miles!
I spoke to a guy who knows his DD's today, he said treat them like the mother-in-law you don't like, hammer them!
According to him, they don't appreciate being treated like babes!
So ???
I reckon the smoke is from:
a) Bad fuel from a mix of old/new fuel in Florida and etc.
b) I had to use multi-grade for about 100nm because I had NO 40w until I got to the trawler suppliers.
c) they are DD's?
Damn I hope I am right as with 200 hours on the motors I don't want to be spending $$$'s
cheers
ROFLAO :)Quote:
Originally Posted by rsmith
Good one made my morning!
Oh those Techs must be smoking something just remember none of that crap works all snake oil. And I use the hot Tub!Quote:
Originally Posted by Scrod
I have spotless tanks and do Fuel filters every two years or more because of guilt only because of Global warming.
Quote:
Originally Posted by 34Hatt
I used that stuff you make and it made no difference in the amount of smoke coming from my engines. How much do I need to add to get some smoke? :D
Quote:
Originally Posted by Boatsb
Okay, SCROD & 34hatt, I am missing an inside joke, although maybe I should be asking for the Australian rights to sell 34Hatts bath tub formula Downunder???
While I am here, can you guys recommend a good book for me to learn how to do the simplest maintenance things?
As in "Takin' care of 12V71n's for IDIOTS!"
Just read it HERE!! BLIMEY!! ws
Just be sure to not get any lipstick on your dipstick !!!!
Quote:
Originally Posted by Canuck Dennis
Hah,
Different continents, but same connotation on "dipstick!"