| Author |
Message |
    
John Bednar
Member
Username: Icanski2
TX
Registered: 7-2005
Post Number: 1
| | Posted on Tuesday, November 01, 2005 - 11:01 pm: | 
|
This is my first post and I would like to thank all the members for the wealth of great information they have made available to everyone. I have done some searches on this topic first, but I have been unable to find what I was looking for. So here goes....
I am finishing up my 1975 214 restoration and the engine seems to run OK. However, the crankcase appears to have a lot of blow-by.(less than 1 hour on rebuild) It doesn't blow the dipstick out, but it definitely has significant positive pressure. I'm not sure if the rings need to seat or what.
I had the block bored to match the .010 over piston and block decked. new valve guides, valve job and the head resurfaced. The crank was turned to match the new rod. and everything mick ed up before assembly. The machine work was done by a reputable shop.
I did take the breather back apart to verify proper assembly and that checked out fine. How much blow-by is normal during break in?
(Message edited by icanski2 on November 01, 2005) |
Brad B
Member
Username: Gy67
IA
Registered: 9-2004
Post Number: 278
| | Posted on Wednesday, November 02, 2005 - 7:42 am: |
|
I had this exact problem with the rebuild on my 140 w/K321 this Summer. I did everything exactly as you had done to your and expected a problem free start up but to no avail. What happened on mine was the bottom ring on the piston, the ends had over lapped allowing oil to pass by and make sure that there were no mosquitoes around that tractor while it was running. Blue smoke EVERYWHERE. I thought the same thing as you that the rings needed to seat themselves but after about a hours run time I gave up and decided to tear the engine down again. Hope yours is an easy fix and be sure to let us know the out come. |
Edward H. Lincoln
Member
Username: Ed_lincoln
Wa.
Registered: 7-2003
Post Number: 522
| | Posted on Wednesday, November 02, 2005 - 9:44 am: |
|
If you are getting this blow-by when you pull the dipstick out when the engine is running, it is normal. I removed the dipstick on my 77 212 after installing a new short block and it still had some oil vapor spray buy a whole lot less than the old engine. |
Neil Terry
Member
Username: Terryna
IL
Registered: 11-2002
Post Number: 87
| | Posted on Wednesday, November 02, 2005 - 12:18 pm: |
|
John,
Make sure that the breather assembly is put together properly. Kohler K's were intended to operate with a crankcase vacuum (e.g. lower than ambient) pressure. I think the spec. value is 10-15 inches of water, I believe that the Kohler manual calls this out somewhere.
You can build a simple manometer to check to pressure. I have one that I made with clear plastic tubing and peg board. I'll try to post a picture later. I would recommend using oil instead of water as the working fluid, just in case you would suck some into the crankcase on accident. You can adjust the pressure by the specific gravity of oil, which is approximately 0.9.
I have a friend who bought a tractor cheap b/c the engine was blowing oil everywhere after a rebuild. The owner was fed up, and sold the tractor cheap. He assembled the breather properly and had a newly rebuilt engine!!
Neil |
Neil Terry
Member
Username: Terryna
IL
Registered: 11-2002
Post Number: 88
| | Posted on Wednesday, November 02, 2005 - 1:06 pm: |
|
I stand corrected, it should be 5-10 inches of water. Page 23 in the Kohler manual:
http://www.kohlerengines.com/common/resources/tp_2379.pdf
Neil |
John Bednar
Member
Username: Icanski2
TX
Registered: 7-2005
Post Number: 2
| | Posted on Wednesday, November 02, 2005 - 6:52 pm: |
|
Thanks Neil, I'm pretty sure the breather is correct I just took it apart to check again and it was good. (I have the Kohler and John Deere Shop manuals).I'll test run it it again tomorrow.
By the way, the engine does not smoke at all, and I rechecked the valve clearances while I had the breather off. |
Neil Terry
Member
Username: Terryna
IL
Registered: 11-2002
Post Number: 89
| | Posted on Thursday, November 03, 2005 - 6:06 am: |
|
John,
I'm sure you have the breather right, I should've read your initial message a little closer.
Sounds like the valve train was completely redone. Did you check the end gap on the compression ring? I wouldn't expect much blowby at no load. |
Joseph M McColligan
Member
Username: Joe_mac
Pa
Registered: 11-2003
Post Number: 553
| | Posted on Thursday, November 03, 2005 - 3:07 pm: |
|
John, your rings are probably not seated. I hope you didnt use synthetic oil for breakin. A 30W oil is recommended for breakin. Also, was the cylinder honed properly? You should have a good crosshatch to help ring seating. As far as blowby goes, once the rings seat, you shouldnt have any. In fact you should have a slight vaccum as described with the manometer test |
Todd Gillfillan
Member
Username: Deereboy
OH
Registered: 12-2003
Post Number: 38
| | Posted on Sunday, November 06, 2005 - 8:42 pm: |
|
A guy my dad bought a 140 with the K321 from had a problem with it smoking after his engine was rebuilt by the JD dealer. What he found to be the problem was the throttle shaft in the carb had some play in it. He took it to a machine shop and had it fixed, and it runs fine now. I don't know if this works every time, but if yours is loose it may be worth a try. |
John Bednar
Member
Username: Icanski2
TX
Registered: 7-2005
Post Number: 4
| | Posted on Friday, November 11, 2005 - 12:54 pm: |
|
I put a throttle shaft kit in the carb. The engine does not smoke. I runs great. It just has positive crankcase pressure at idle. I'm just going to run it for a while and make sure the rings get a chance to seat good before I tear into it much further. If not, I'll pull it apart and recheck the ring end gap and and other things along the same line. Thanks. |
Todd Gillfillan
Member
Username: Deereboy
OH
Registered: 12-2003
Post Number: 40
| | Posted on Saturday, November 12, 2005 - 8:16 pm: |
|
Oops, looks like I miss understood what you meant. |
