Mr Googler
Well-Known Member
I never knew this either
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Engine re-build - Detroit - Desicion made - Start 03 Nov 2011
- Thread starter Divemaster1
- Start date
I never knew this either
Divemaster1
Well-Known Member
Piston now assembled
Crown seated on skirt, with rings installed....
Old against new (note to self ...use other camera):
Crown seated on skirt, with rings installed....
Old against new (note to self ...use other camera):
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Divemaster1
Well-Known Member
BartW
Well-Known Member
and ones you've heard their sound, you will alway's distinguish them from any 4stroke:
http://www.youtube.com/watch?v=Wdy9BY4Fp4I&feature=related
davidej
Well-Known Member
Very interesting.
I have muddled arourd with engines all my life, from motorcycles to cars, o/boards, chainsaws, model areoplane engines etc
I have never seen a 2 str that used poppet valves. I assume that the efficinecy of the combined intake/exhaust stroke is better than using liner ports for both and there is less mixing of the charge/exhaust gasses.
I have muddled arourd with engines all my life, from motorcycles to cars, o/boards, chainsaws, model areoplane engines etc
I have never seen a 2 str that used poppet valves. I assume that the efficinecy of the combined intake/exhaust stroke is better than using liner ports for both and there is less mixing of the charge/exhaust gasses.
tinkicker0
Well-Known Member
LittleShip
Well-Known Member
Divemaster1
Well-Known Member
Mostly assembly otday....
Piston & conrod ... 75 lbs of torque on bolts... and locking compound applied as per instructions from the manual..
Piston into Liner .... now that was a pain .... fire and compression rings slid in fine, but oil scraper rings were a pain .... at the end resorted to large cable ties strapped tightly around the new rings and lowered piston down. Used old piston and liner for testing out how to.... DD have sleeve tool for this, and would make up one if I were to repeat this...
Then new liner and Piston assembly into block.......plenty of lubricant made this piece relatively easy, and connection of the bottom end was relatively easy, but time consuming as I needed to get from underneath the engine (watching and feeling), to the top (pushing the assembly gently down....
Got clamshell bearings on finger tright only, then had to leave .....
Piston & conrod ... 75 lbs of torque on bolts... and locking compound applied as per instructions from the manual..
Piston into Liner .... now that was a pain .... fire and compression rings slid in fine, but oil scraper rings were a pain .... at the end resorted to large cable ties strapped tightly around the new rings and lowered piston down. Used old piston and liner for testing out how to.... DD have sleeve tool for this, and would make up one if I were to repeat this...
Then new liner and Piston assembly into block.......plenty of lubricant made this piece relatively easy, and connection of the bottom end was relatively easy, but time consuming as I needed to get from underneath the engine (watching and feeling), to the top (pushing the assembly gently down....
Got clamshell bearings on finger tright only, then had to leave .....
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AndieMac
Well-Known Member
Good job Alf.
Looking at the background of pic. #2 you did not come out on the hard this winter?
Looking at the background of pic. #2 you did not come out on the hard this winter?
Divemaster1
Well-Known Member
Nope..... more damage done when on the dry, than when in water.... so boat protected by nice warm water, whole hull supported by natural forces...
sigmasailor
Well-Known Member
In my former life as a marine engineer I used to operate Stork SW 2 stroke engines similar to the one here: nice; look.
Those engines operated just like detroit diesels. Lower speed (120 rpm max); more power (2000 hp per cylinder). Pistons were three feet versus a six feet stroke. We had turbos for the scavenging air rather that roots blowers.
The fun part was that each cylinder had 4 exhaust valves (24 in total); burning one or more of those on any crossing was more or less routine.
Divemaster1
Well-Known Member
Think I have given up now trying to find broken pieces of the piston.... Having spent several hours, opening each of the airbox inspection ports, oilpan inspection, valve inspection, turbo inspection etc., I can find no signs of damage anywhere, but have found traces of metal pieces (grit at about 1mm) in the lower airbox deposits, but in no way enough for what was broken off. (have just rememberedone possibility ..... so I will remove, check and re-fit magnetic sump drain bolts before re-filling with oil though)
So have now resorted to torque the piston clamshell bolts to spec and getting ready for the new gaskets and re-fitting of cylinder head... hopefylly by the end of February..
So have now resorted to torque the piston clamshell bolts to spec and getting ready for the new gaskets and re-fitting of cylinder head... hopefylly by the end of February..
Divemaster1
Well-Known Member
Just as an update ...
End of February came and went.... something about work getting in the way....
Now resorted to better planning, so will take part of Friday 23 March off, pick up counter weights for the head so I can use them over an A frame and lower cylinder head down controlled onto the guide studs rather than relying on muscle power ....
End of February came and went.... something about work getting in the way....
Now resorted to better planning, so will take part of Friday 23 March off, pick up counter weights for the head so I can use them over an A frame and lower cylinder head down controlled onto the guide studs rather than relying on muscle power ....
Divemaster1
Well-Known Member
Return of cheap cylinder repair co...
So all been ready for a while, just timing being wrong... but determinded to make progress this weekend, so headed up with high hopes and friend due to meet me fr the heavy lifts on Sat ... did not happen due to a family emergency, so only me, with a 110Kg cylinder head to lower, shift forward, angle to 45 degrees and lower on to block ... not a big deal really, appart for needing millimetre accuracy whilst handling the heavy load....
Found another use for parts of my emergency tiller as strong bar between frames holding head...
Engine ready with seals etc., to receive head ... one guide stud available and in situ here..
Managed to manouver frames over head, fixing he head suspended in the frames individually before getting ready for lowering the head down... head need to go down and forwards to get the weight onto the rope you see going down at the front of the forward frame. This hole is right above where the head's forward lifting lug is when installed...
Cross bar in place and slow lowering commenced on Saturday PM... getting the head into a low position ready to transfer forwads under the deck... with induced angle for fitting ...here about 2/3 way forwards....
And finally head in place, bolted down after quite a lot of hard work adjusting angles, front back, onto guides, checking seals intact etc...
Pleased with the progress all be it slower than intended, but progress irrespecive... next week-end will hopefully be re-assembly of governor, fuel rack & system, turbocharger, manifolds and pipes ... then valve and injector adjustments etc., and fill up with fluids.... a lot of work still to do, but making progress ....
So all been ready for a while, just timing being wrong... but determinded to make progress this weekend, so headed up with high hopes and friend due to meet me fr the heavy lifts on Sat ... did not happen due to a family emergency, so only me, with a 110Kg cylinder head to lower, shift forward, angle to 45 degrees and lower on to block ... not a big deal really, appart for needing millimetre accuracy whilst handling the heavy load....
Found another use for parts of my emergency tiller as strong bar between frames holding head...
Engine ready with seals etc., to receive head ... one guide stud available and in situ here..
Managed to manouver frames over head, fixing he head suspended in the frames individually before getting ready for lowering the head down... head need to go down and forwards to get the weight onto the rope you see going down at the front of the forward frame. This hole is right above where the head's forward lifting lug is when installed...
Cross bar in place and slow lowering commenced on Saturday PM... getting the head into a low position ready to transfer forwads under the deck... with induced angle for fitting ...here about 2/3 way forwards....
And finally head in place, bolted down after quite a lot of hard work adjusting angles, front back, onto guides, checking seals intact etc...
Pleased with the progress all be it slower than intended, but progress irrespecive... next week-end will hopefully be re-assembly of governor, fuel rack & system, turbocharger, manifolds and pipes ... then valve and injector adjustments etc., and fill up with fluids.... a lot of work still to do, but making progress ....
AndieMac
Well-Known Member
thanks for taking the time to stop during the lowering/positioning process and take the pics to post Alf.
At least the heavy stuff is over now.
It's hard on the body getting yourself jammed into confined spaces and working on funny angles for long periods of time, epecially when weight is involved, like this job or changing large battery banks.
At least the heavy stuff is over now.
It's hard on the body getting yourself jammed into confined spaces and working on funny angles for long periods of time, epecially when weight is involved, like this job or changing large battery banks.
vas
Well-Known Member
exhausted just reading your last post and looking at the pics...
Well done, so may expect an easter test run then?
BTW, how are you going to clean the teak deck from oil/diesel patches as seen in first pic?
cheers
V.
Well done, so may expect an easter test run then?
BTW, how are you going to clean the teak deck from oil/diesel patches as seen in first pic?
cheers
V.
Divemaster1
Well-Known Member
Big wet patch in picture is water, so easy....
but whole aft deck will need a good scrub.... and at some stage, as it is only laminate, it will need a full replacement...
STEVEDUNSTABLE
Well-Known Member
hi divemaster.....have followed your rebuild thread from the start..very interesting...as you seem to be on the downhill run heading for a test startup, just hope it goes better than this !!!!!........ http://www.youtube.com/watch?feature=endscreen&NR=1&v=WrAeUf7v49g .. (well it made me laugh!!).. congrats to all concerned with your project and thanks for taking the time n trouble for the piccies and updates....
Divemaster1
Well-Known Member
Thanks !!...
On a different note...A runaway diesel is never "fun" when you experience it, and that big old semi-deisel should have been made more secure before attempting to start her up...
It will take me the best part of the week-end to reasemble the other bits and prepare for the tune-up and subsequent startup. I am not worried about runaway, as The piston rings etc., does form a good seal, preventing lube oil becoming the fuel. That coupled with the fact that I can have manual control of the diesel and block air off, means I have several ways of starving the engine from at least one of the ingrediences for a runaway...
.... well, at least so I hope, but only time will tell !!
On a different note...A runaway diesel is never "fun" when you experience it, and that big old semi-deisel should have been made more secure before attempting to start her up...
It will take me the best part of the week-end to reasemble the other bits and prepare for the tune-up and subsequent startup. I am not worried about runaway, as The piston rings etc., does form a good seal, preventing lube oil becoming the fuel. That coupled with the fact that I can have manual control of the diesel and block air off, means I have several ways of starving the engine from at least one of the ingrediences for a runaway...
.... well, at least so I hope, but only time will tell !!
LittleShip
Well-Known Member
Well done Alf..........
