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chris cole
Unregistered guest
Posted From: 68.119.229.238
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 15, 2006 - 12:23 am: | |
is 450,000 miles alot of miles for a dd8v71?{bus has 450k on it, runs great,very little smoke. |
RJ Long (Rjlong)
Registered Member
Username: Rjlong
Post Number: 977
Registered: 12-2000
Posted From: 71.195.113.23
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 15, 2006 - 2:53 am: | |
Yes |
mel 4104
Unregistered guest
Posted From: 208.181.100.45
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 15, 2006 - 10:50 pm: | |
RJ is right it is a lot of miles as some get rebuilt real quick and others for some reason go for ever so if it is running good just look after it as if it was your new engine and it just might outlast you. change the oil as required be sure to never over heat it and NEVER use starting fluid in it and on cool which is before cold days be sure to plug in the block heater and warm it up before you try to start it and it may go for another 500,000 miles++++ |
David Dulmage (Daved)
Registered Member
Username: Daved
Post Number: 121
Registered: 12-2003
Posted From: 142.46.199.30
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 10:27 am: | |
If the bus has 450k on it, it's possible that the engine may have already had some major work done on it.
DaveD |
Bob Greenwood
Unregistered guest
Posted From: 65.150.45.49
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 11:57 am: | |
I'm sure it has probably had a kit put in it if it uses no oil,it's not really a big deal to put a kit in them,most people think if they have engine trouble,they just get another engine, the kit has new cylinders,new pistons,new rings,new inserts,new main bearings,you have virtualy a new engine,you just pull out the old cylinders & plug in the new ones. these engines were made to go millions of miles,normally they are called "WET SLEAVE" engines,but in the case of 2-cycle engines they arecalled dry sleave. |
Steve N. (N4rsn)
Registered Member
Username: N4rsn
Post Number: 88
Registered: 2-2005
Posted From: 70.253.169.39
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 12:38 pm: | |
Hummmm The 8-71 is a dry sleeve, but the 8v-92 is a wet sleeve
Steve |
chris cole
Unregistered guest
Posted From: 68.119.229.238
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 12:40 pm: | |
bob makes it sound like "putting a kit in it " is so simple. how much does this kind of work cost when needed? |
chris cole
Unregistered guest
Posted From: 68.119.229.238
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 12:44 pm: | |
how can you tell if the engine has had work done on it or not?{no signs of leaks other than the tubes, and very little smoke} |
Bob Greenwood
Unregistered guest
Posted From: 63.232.215.36
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 1:26 pm: | |
hmmmmmm....dry sleave means no water around the cylinder walls hmmmmmmm. do you have water around your cylinder walls steve,if so ,how does your engine get air, hmmmmmmmmm |
Bob Greenwood
Unregistered guest
Posted From: 63.232.215.36
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 1:43 pm: | |
Chris, the diesel engine is very well made, nothing is simple,with a car (gasoline) engine,to overhal it,you take the block to be bored & buy bigger pistons & bigger rings,the diesel,you just REPLACE the removeable cylinders,it's easier to tell on a diesel by how much oil it's useing,as to how long before rebuild,because it's happy to run on oil as it is to run on diesel,if it doesn't 'use' oil, you are in good shape, if you use more than a gallon in 1000 miles,you need to start planing on a kit,they cost about 1700 & the mechanic will charge about 2500 to r&r eveything,not cheap,but,you have an expencive toy. |
Bob Greenwood
Unregistered guest
Posted From: 65.150.47.119
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 2:49 pm: | |
The best way to explain a dietroit 2-cycle ,is look at a model airplane engine,it has two slots at the bottom of the cylinder,move the prop around & you will see the piston come down PAST the slots, it is getting a 'bite' of air, then if you want to understand more,look at a 6-71 engine,notice the supercharger is on the side of the block,it is pressuriseing the block,when the piston comes down ,the pressurized air in the block CRAMS air in the cylinder & it goes up & with 'more' air to compress,it creats more power. |
Dale Waller (Happycampersrus)
Registered Member
Username: Happycampersrus
Post Number: 210
Registered: 7-2005
Posted From: 68.65.122.187
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 5:20 pm: | |
Steve is correct. The 71 series is a dry sleeve engine. The 92 series is a wet sleeve engine. The 71 series liners do not contact coolant. On the 92 series the liners are in direct contact with the coolant.
Dale |
Tom Caffrey (Pvcces)
Registered Member
Username: Pvcces
Post Number: 962
Registered: 5-2001
Posted From: 65.74.70.16
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 7:47 pm: | |
And here I thought that the difference between a dry block and a wet block 8V71 was due to some having wet liners. And that that was the reason that the inspection ports are so small on the later engines.
Isn't it?
Tom Caffrey PD4106-2576
Suncatcher
Ketchikan, Alaska |
Dale Waller (Happycampersrus)
Registered Member
Username: Happycampersrus
Post Number: 211
Registered: 7-2005
Posted From: 68.65.122.187
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 17, 2006 - 8:47 pm: | |
There are 2 types of blocks in the v71 series.
The early block was a dry cylinder block, meaning that in the area below the liner ports there was no water jacket.
The later block is designated "Water below port cylinder block". All that means is that block had a water jacket cast into it for improved cooling below the liner port belt. That block does not have wet liners, but has the smaller air box covers.
The v71 series book section 1.1, page 1 & 2 has pictures and descriptions of both blocks.
I have overhauled both types and trust me neither block has wet liners.
Dale |
Chuck Lott (Chuckmc8)
Registered Member
Username: Chuckmc8
Post Number: 170
Registered: 5-2004
Posted From: 68.223.105.49
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, July 18, 2006 - 7:21 am: | |
Chris, I'll try to answer your question-
bob makes it sound like "putting a kit in it " is so simple. how much does this kind of work cost when needed?
#1 is that the heads are very heavy, you need a cherry picker to R&R the heads. I had to make an extension boom (about 2')for the cherry picker to get the extra needed reach into the bus. Do you have a DD service manual? If not, email me (click on my profile)
The heads should be taken to a qualified shop and worked as part of a build- I paid $400 each to have mine done, including surfacing, etc. I think that was excessive $$, but thats what they charged, and it was done right.
The cylinder and liners are called a "kit" aftermarket last week cost $236 plus tax per kit. From DD, they were right at $400 each. When I last called the DD dealer, the MFG was out of stock and siad they were none available at the moment anywhere. Swapping them in and out isnt very hard, but theres "some know how" that needs too be applied here. The kits come in various sizes, as the fit of the cylinder liner to the block is critical. The service manual has instructions to determin this with a dial indicator. You also need the dial indicator to determine the height of the installed liner, which is adjustable with shims that come in the engine gasket kit. That relationship is critical as it deteremines the head gasket sealing.
This would be an "inframe", themost common build. Of course,you would also change the rod bearings when you reinstall the connecting rods.
The piston rings on a DD are not compatible with a regular piston ring squeezer. DD makes a special tool, but on the DD yahoo! 2 cycle DD engine forum page, there is directions to fab one out of an old cylinder liner. A regular piston ring squeezer will allow the edges of the oil control ring to be knocked off.
So, to answer your question, without labor, heads and liner kits would be $4000 with DD parts, aftermarket cylinder kits $2688
You still need some misc stuff,gasket kit, oil & filter, coolant etc.
The rack (valves and injectors) need professional attention also. Its certainly learnable, but you need to actually be coached by qualified DD mechanic to double check as you work.
So, the work is not difficult, with the exception of the heads being heavy, but you have to pay attention to those key measurements and adjustments that make for a lasting quality job.
If a person does the work himself and can find a qualified DD guy to stop by with his dial indicator at the opportune time and help determine the parts, then stop by and set the rack, then its do-able yourself. Be careful with the piston rings, tho. I would probably pay to have a shop fit the rings on the pistons and install them in the cylinders at their place.
Most shop labor these days is $85 and hour, I dont know what the book time is for an inframe.
I would expect to pay a stop by the house DD mech about a Ben Franklin each time I asked him to come by.
Hope this helps, other may have a different take on it- Chuck |
Tom Caffrey (Pvcces)
Registered Member
Username: Pvcces
Post Number: 963
Registered: 5-2001
Posted From: 65.74.70.16
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, July 18, 2006 - 10:41 pm: | |
Thanks, Dale.
Tom Caffrey PD4106-2576
Suncatcher
Ketchikan, Alaska |
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