Go BottomRebuild Yang Dong Y385 Tractor Engine Settings Manual
 | Terrymc
Join Date: Nov 2009 Posts: 2 Queensland Australia 
|
2009-11-25 167030
I am in the process of rebuilding my Yang dong Y385 engine can any body help me with a operation & maintenance manual or the settings for Cylinder head tensions and big end caps Timing etc
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
 | greg_g
Join Date: Jan 2004 Posts: 1816 Western Kentucky 
 Pics
|
2009-11-25 167031
Cylinder head bolts 160 Nm (~118 ft-lb)
The following are listed for the Y485, but it's a Y85 manual. Stands to reason then, that they apply to the Y385 as well. Only physical difference between the two engines is one cylinder.
Main bearing cap bolts 185 Nm (~136 ft-lb)
Connecting rod bolts 120 Nm (~89 ft-lb)
Flywheel bolts 65 Nm (~48 ft-lb)
all values are +/- 10 Nm (~7 ft-lb)
Bell housing bolts don't have a torque spec, but several owners have found them to vibrate loose. LockTite is recommended.
//greg//
....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| springcity
Join Date: Dec 2009 Posts: 2 Spring City, TN. 37381
|
2009-12-04 167195
Rebuilding the 3 cylinder Y385 engine
Wow your torques spec are far bigger than mine.
I received the following from Northern tool.
Main bearing housing bolts 65-75 Ft/lbs
Flywheel bolts 65-90ft/lbs
Cylinder head bolts 75-95 ft/lbs
Connecting Rod Bolts 65-75 ft/lbs
Rocker Arms bolts 14-16 ft/lbs
intake and exhaust 12/14 ft/lbs
Hydraulic Pump 12-14 ft/lbs
I believe the torque spec you are using are for the 35 Plus horsepower engines. Not being critical, just concerned for I am rebuilding the same 3 cyl. Y385
I have also had the bell housing bolts vibrate loose, so I agree loctite all the bolts. There should be more engine specs information on the internet but for the life of me I haven't found much. This engine has been produced since 1999 and it the biggest engine producer in China. It worries me that we have such different torque values for the same engine. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| greg_g
Join Date: Jan 2004 Posts: 1816 Western Kentucky
Pics
|
2009-12-04 167196
|
Quote:
|
My YangDong manuals are titled Y85, because they cover both the Y385 and Y485. Other than the fact that one is a 3 cylinder and one is a 4 cylinder, they're the same basic engine. I previously owned two Y385T-powered tractors (circa 1999-2001), and currently own one Y485T (2006) and a FD395 (2004).
//greg// ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| yangdong
Join Date: Apr 2010 Posts: 2 Nashville TN
|
2010-04-13 169970
Torque specs, for Y385 as given to me by JM Parts.com....
I used these specs in a build, and these are the results. All specs in Foot Poundsrather than Newton Meters.
Flywheel 36-44 Foot Pounds---About Right
Head 110-125 ---------- 125 is close to the failure point of bolts
Rod 36-44-------------About Right.. Note-for this bolt diameter,
80 foot pounds or so will ruin the bolts
Mains 81-95----------- Don't know, didn't change the mains.
Please be patient when researching data, and it might be wise to compare
torques and bolt diameters for high test bolts with fine threads, to see if the
specs seem right to you. The head and rod bolts are not marked with numbers to indicate their tensile strength, but I would assume they are high test. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| harpojake
Join Date: Jan 2012 Posts: 5 mechanicsville va
|
2012-01-06 181929
does anyone know what kind of compression readings i should get on a y385? and has anyone experienced a 385 that wont start and sucks your hand to the exhaust pipe when cranking? i have no broken timing gears and the camshaft key is in tact. thanks for your info
....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| greg_g
Join Date: Jan 2004 Posts: 1816 Western Kentucky
Pics
|
2012-01-06 181930
1. Compression ratio is 22:1 and 22 atmospheres = 323 psi.
2. Pretty sure most Jinma owners have had difficulty starting at one time or another, we'd need more details to help troubleshoot.
3. Aggressive intake vacuum is normal for diesels.
//greg// ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| richwaugh
Join Date: Mar 2010 Posts: 96
|
2012-01-06 181932
Greg,
He said that the engine sucked his hand to the EXHAUST pipe. I've no idea how that could happen unless the exhaust valve(s) was open on the intake stroke while the intake valve was closed. Normal valve timing would have the exhaust valve open on the piston's upstroke, not the downstroke, right? So either the cam is wacky or the crankshaft is in upside down (joke).
In any event, it is going to be necessary to pull the valve cover and observe the actual valve action when the engine is cranking. Something is obviously very wrong. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| greg_g
Join Date: Jan 2004 Posts: 1816 Western Kentucky
Pics
|
2012-01-07 181933
My mistake on the exhaust versus intake, sorry. The muffler will suck air if one or more exhaust valves are stuck open for any reason. I'm guessing that's why you asked about the compression test.
//greg// ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| Grampsinnm
Join Date: Aug 2011 Posts: 4 New Mexico
|
2012-01-08 181941
Is it feasible the engine is turning over backwards? Like being wired backwards. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| harpojake
Join Date: Jan 2012 Posts: 5 mechanicsville va
|
2012-01-08 181942
what i origionally thaught was exactly that. that valve timing was off and the piston(s) were going down with the exhaust valve open causing the sucking, ive pulled the valve cover, timing cover and cam bolt to check for broken parts and found none. all valves are moving. i tried to do a compression test on #2 cylinder and my guage jumped up for a second then shot back to zero... like a vacume against my guage?? i used two different guages to make sure it wasnt my tool.... im thinking the next step is to pull the head and look for burnt valves or blown head gasket allowing vacume travel between cylinders. i tried to do a leak-down test and for some reason couldnt get a good reading... anyone against or for any of this?? comments? reasons why? why not? am i on the right track? thanks for your help. its been quite frustrating. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| harpojake
Join Date: Jan 2012 Posts: 5 mechanicsville va
|
2012-01-08 181943
i have never heard of such a thing... not sure how the starter could turn the engine over backwards. its just a hot wire from the solenoid to the starter. couldnt see that happening but your right that would explain the symptom haha ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| Grampsinnm
Join Date: Aug 2011 Posts: 4 New Mexico
|
2012-01-10 181960
Well it seems all our experts here have never heard of such a thing either. Being a simple person I first look for simple answers. Has anything been recently rewired/replaced? Could a bad switch cause this. Have you actually ascertained that the engine is turning over in the proper direction? If you can confirm that then I would look to engine internals but not before. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| richwaugh
Join Date: Mar 2010 Posts: 96
|
2012-01-10 181961
If the starter ran backwards the Bendix unit would not throw the pinion gear into engagement with the flywheel. The engine won't turn backwards unless you physically reverse the starter motor on the flywheel and I sincerely doubt that happened.
Vacuum at the exhaust indicates an open exhaust valve on the piston down stroke - that, or an internal engine block/head leak between the cylinder and the exhaust passage. However, a mere crack would, I think, whistle or scream noticeably and not actually create much suction at the exhaust. I still say a valve problem. ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| harpojake
Join Date: Jan 2012 Posts: 5 mechanicsville va
|
2012-01-11 181988
ok. i pulled the head. all the valves were fine(not burnt anyways) i rotated the motor and the #2 cylinder sleeve came up out of the block with the piston. so not machined correctly. but how would this cause suction on the exhaust? prob time to price a new engine. between diag. and repair/machine shop cost its probably more practical for the customer ....
Reply to |
Quote Reply |
Add PhotoRebuild Yang Dong Y385 Tractor Engine Settings Manual
| richwaugh
Join Date: Mar 2010 Posts: 96
|
2012-01-11 182019
It's not unheard of for a cylinder sleeve to pop up like that - may just mean a bad O-ring on a wet-sleeved engine. I'd suggest you call Tommy at Affordable Tractor Sales in Texas. He's a great source, and would likely be your best bet for assistance with information and/or parts, up to an entire engine if need be. Good odds that you don't need a new engine though - call him. 979.865.4002 ....
Reply to |
Quote Reply |
Add Photo
Go Top
Share This