Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 17-08-2018, 06:17   #31
Registered User
 
GeneM's Avatar

Join Date: Jul 2014
Location: Harbortown - Merritt Island, FL
Boat: 1998 Sealine Statesman 42ft - Twin Cummins 6BTA
Posts: 208
Re: Bore Honing Without Engine Removal

Thanks all - I'm an engine novice and have an oil problem on my Cummins 6BTA-M2 370 HP. It uses a quart every 4 hrs and the turbo gums up at 40 hrs - oil change. Any advice?
GeneM is offline   Reply With Quote
Old 17-08-2018, 06:22   #32
Moderator Emeritus
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
Bore Honing Without Engine Removal

How many hours on the engine? How old is it?
Does it smoke like a train when first started, but then clear up?
Does it blow blue smoke when cruising, fully warmed up?
Is it hard starting, does it make good power? Have you had a compression check done?
Can you afford an overhaul?

You may consider a separate thread so that things donít get mixed up.
a64pilot is offline   Reply With Quote
Old 17-08-2018, 06:32   #33
Registered User
 
Sailmonkey's Avatar

Join Date: Sep 2009
Location: Houston
Boat: Ď01 Catana 401
Posts: 9,626
Re: Bore Honing Without Engine Removal

Quote:
Originally Posted by GeneM View Post
Thanks all - I'm an engine novice and have an oil problem on my Cummins 6BTA-M2 370 HP. It uses a quart every 4 hrs and the turbo gums up at 40 hrs - oil change. Any advice?


As A64 said, a separate thread is what you need.

Also, in what way is the turbo gummed up?
Sailmonkey is offline   Reply With Quote
Old 17-08-2018, 13:09   #34
Registered User
 
GeneM's Avatar

Join Date: Jul 2014
Location: Harbortown - Merritt Island, FL
Boat: 1998 Sealine Statesman 42ft - Twin Cummins 6BTA
Posts: 208
Re: Bore Honing Without Engine Removal

Hours=2000 installed 1998

Smokes a lot starting, but clears up only a little

Not very blue smoke.

Very hard starting.

Makes good power with clean oil, but if I run at cruising speed, the oil gums up fast and the turbo quits.

I plan to overhaul soon, but was hoping your hone discussion was an option.

Also, the oil fill cap blows much oil vapor when opened at idle.

Sorry for mixing up. I'll get out now.
GeneM is offline   Reply With Quote
Old 17-08-2018, 13:34   #35
Moderator Emeritus
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
Re: Bore Honing Without Engine Removal

She is almost certainly excessive blow by, that and the hard starting really points to a worn top end.
While I am not familiar with that particular engine, Cummins has a strong reputation.

If it has good oil pressure and you can get the pan off, and if it has wet sleeves, Iíd replace the sleeves, have the head overhauled and you pretty much have a new motor.
a64pilot is offline   Reply With Quote
Old 17-08-2018, 13:36   #36
Moderator Emeritus
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
Bore Honing Without Engine Removal

Quote:
Originally Posted by Sailmonkey View Post
Also, in what way is the turbo gummed up?


Most engines feed the crankcase breather into the suck side of the turbo.
Something I think is foolish, but if you have excessive blow by, your pumping oil and lots of oil vapor into the turbo, enough of that and it will gum up and stop producing boost.
a64pilot is offline   Reply With Quote
Old 17-08-2018, 13:38   #37
Moderator Emeritus
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
Bore Honing Without Engine Removal

I would start a new thread and letís dig into it, someone has to know that motor intimately. If I go to the dark side, a Cummins in-line 6 is on my short list of preferred engines
a64pilot is offline   Reply With Quote
Old 17-08-2018, 18:16   #38
Marine Service Provider

Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,813
Re: Bore Honing Without Engine Removal

Does it have an air cleaner? From experience I know a clogged air cleaner can cause you to use lots of oil. But thats just one check that you need to do
Compass790 is offline   Reply With Quote
Old 18-08-2018, 00:30   #39
Registered User

Join Date: Sep 2008
Location: Surrey, B.C. Canada
Boat: Passage 24/30 Cutter
Posts: 683
Re: Bore Honing Without Engine Removal

Quote:
Originally Posted by alaskaflyfish View Post
The old time aircraft mechanics (circa.1950's) up here in Alaska used to take a handful of Bon-Ami powder cleaner (like Ajax) and stuff it into the intake while the engine was running high rpm. They said it was the best way to de-glase the cylinder walls if the break in process was done inappropriately. I would never do it, but on a old lawnmower,,(humm).. If you do try to hone your cylinder walls, piston and crank out of the block is best. Get a good quality rigid hone that is adjustable to .001 of and inch.
I've heard of this 'trick' also. I'm told CAT dealers sell a product (or used to) that basically is Bon-Ami powder. But check it out yourself it may be the quick answer to your problem.
First I would call a CAT Parts Department & ask them if they do sell such a product. If so, I would imagine it would have complete instructions on how to use it.
I did witness a truck driver use a similar product called Comet. He said it worked wonders for seating the rings.
Sailorbob8599 is offline   Reply With Quote
Old 24-08-2018, 07:06   #40
Registered User

Join Date: Sep 2008
Posts: 26
Images: 1
Re: Bore Honing Without Engine Removal

It appears that the single greatest headache for you is the smoke and perhaps oil dripping from the air filter.

Consider altering your exhaust pipe and routing so that the exhaust is
split into several pipes and delivered to different exit points from your
boat so that all of the individual exhaust clouds will be
proportionately smaller AND proportionately less aggravating for you.

As far as dripping air filter, take the blow by tube from the crankcase
to the air filter and in the middle of the hose insert a large can of
some type that looks like a mini muffler so that the air flow slows
down substantially and allows the oil mist to drop out of the air flow.
This is commonly called an oil separator.... or you could take some
of the fuel/water filters with clear bottoms that are used to allow
the water to fall to the bottom and remove the filter element and
put that inline with the breather.... That will help the oil mist drop
out as well. It is the same principle as the oil separators.
Lastly.... realize that if you are adding 1 quart every 100 hours....
you will never have to change oil again as you are progressively
changing the oil a little at a time. (especially if you are using synthetic
oil) BTW, what is your oil change interval in terms of hours anyway ?
And how dirty has it been when changing ? One last thought,
increase the thickness of the oil by selecting a heavier weight oil.
preventec47 is offline   Reply With Quote
Old 24-08-2018, 08:18   #41
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,551
Re: Bore Honing Without Engine Removal

Hi Dockhead, I rebuild Yanmars on regular basis and am surprised that so far no mention has been made of replacing the liners, on most of the 4JH series they just slide right out with minimal effort. Best way to do the job in the boat is to remove the gearbox and sit the engine on the flywheel housing then you can easily access both the top and bottom end. Do the front and rear crankshaft oil seals as well as the cylinder head overhaul.
skipperpete is online now   Reply With Quote
Old 24-08-2018, 08:20   #42
Registered User

Join Date: Apr 2017
Location: Queensland Oz
Posts: 295
Re: Bore Honing Without Engine Removal

Quote:
Originally Posted by alaskaflyfish View Post
The old time aircraft mechanics (circa.1950's) up here in Alaska used to take a handful of Bon-Ami powder cleaner (like Ajax) and stuff it into the intake while the engine was running high rpm. They said it was the best way to de-glase the cylinder walls if the break in process was done inappropriately. I would never do it, but on a old lawnmower,,(humm).. If you do try to hone your cylinder walls, piston and crank out of the block is best. Get a good quality rigid hone that is adjustable to .001 of and inch.
The 325 passenger international cat I ran in the Great Barrier Reef tourist trade had a large area to air condition. It was fitted with a 3 53 GM diesel 110 KW generator. It needed 80 KW minimum to drive the air conditioning & refrigeration plant in summer, but only about 25 KW to drive just the refrigeration in winter.

Running this gently for 11 hours each day, it would glaze it's bores each winter, & be unable to supply enough power come summer. We would feed it a desert spoon full of Bon-Ami per cylinder, & run it for an hour or so, after which we would give it a good flush & a couple of oil changes. This brought it's power fully back.

This worked for 3 years. The 4Th year it was getting a bit smoky, so we shouted it a set of pistons & liners. When stripped we found the pistons & liners were fine, & even the rings were not too worn, but they were very gummy in the ring grooves. Cleaning them out was probably all that was required.

We found a dose of STP engine oil treatment would free up rings in some boats that did little work for months during the wet season. They would be very smoky when asked to come back to work, but an hour or 2 with STP then an oil change usually fixed them.
Hasbeen is offline   Reply With Quote
Old 24-08-2018, 08:21   #43
Moderator Emeritus
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
Re: Bore Honing Without Engine Removal

Iím glad you brought the liners up.
According to my local Yanmar parts dealer, my 4JHE has wet liners, but they are not replaceable?
So are they wet liners that are cast in?
a64pilot is offline   Reply With Quote
Old 24-08-2018, 08:46   #44
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,551
Re: Bore Honing Without Engine Removal

Seemingly the 4JH3 is about the only one in the 4JH series with no liners. The cylinder is cast into the block, not a wet sleeve.I'll read back through the other posts to see if there's an easier solution other than a cylinder hone. The turbo has to be a suspect if it's using a lot of engine oil and excessive blow by can really only be a piston/ ring / cylinder issue
skipperpete is online now   Reply With Quote
Old 24-08-2018, 13:47   #45
Registered User

Join Date: Aug 2011
Location: Georgia
Boat: Electra/Ariel/Triton
Posts: 299
Re: Bore Honing Without Engine Removal

Quote:
Originally Posted by captlloyd View Post
Bite the bullet and pull it, you are going to have it half way apart anyway.
How much money do you really want to waste??? There is no halfed assed way to fix an engine. What do you really think honing will do? No one polished the bores , the bores are worn period, they may very well not even be round right now from running with the pistons knocking around in the bore. Bon Ami is an aviation hoax. Where does the Bon Ami go after going into the bores?? into the oil, then the bearings, then the cam and valvetrain...... engine junk!!!.
Heck just a gasket kit is $400 plus labor for what a patched up engine. There is NO hone that measures in .001/1000th Hones do not measure, micrometers measure, sorry!!
Follow captlloyd's advice. Please pardon my way of expressing myself, I'm only trying to help!!!
Carl-T705 is offline   Reply With Quote
Reply

Tags
engine, engine removal, removal

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Barnacle removal without scraping 0urh Construction, Maintenance & Refit 211 30-06-2021 05:10
Oversized Yanmar 3GM30 Cylinder bore pierrrre Engines and Propulsion Systems 26 25-02-2015 22:01
O'Day 30 table removal and settee removal biker6977 Construction, Maintenance & Refit 2 25-09-2014 08:40
Engine Bay Makeover - Rewiring - Including Engine Removal! blahman Electrical: Batteries, Generators & Solar 52 02-12-2009 09:01
Boat search - honing in... alstki Monohull Sailboats 12 07-12-2005 13:08

Advertise Here


All times are GMT -7. The time now is 02:36.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.