Positive crankcase ventilation

[Ted in NE-OH]

Has anyone tried to retrofit PCV to an old tractor to solve blowby

 

[rustred]

Has anyone tried to retrofit PCV to an old tractor to solve blowby

actually what tractor ? they actually do have a crankcase ventilation , dont know how positive it is. if your blowby is that bad then u need to overhaul the engine. sucking that much gunk back into the intake is not a good idea anyhow, your not going to solve the blowby this way . it is basically to reburn the fumes from the crankcase not to suck blowby sludge , be pretty hard on the spark plugs with added sludge on already carboned up plugs from oil. plus these old tractors dont run hot enough anyhow for it to work with a bunch of blowby. you need to fix the blowby problem with what it takes , like sleeves pistons rings and valves, so the compression is sealed and not leaking past the rings.

 

[Factotum]

I "reworked" a pcv on a 1982 Ford Escort that had really bad blowby. The car was a project I bought for $50, I fixed up for my girlfriend. It needed more than what I could afford at the time, it got the backyard rebuild. #4 piston had a hole in it and there were a few collapsed lifters. The car was in great shape, no rust that is, and should have been rebuilt correctly. Being 17 myself I didn't have the funds to do it right or get her a Mercedes. Circa 1988 or 89. I removed the pcv valve and placed a ball valve in there opened a "calculated" amount. It did in fact work better than without. Without, it would blow the dipstick out and foul the air filter with oil. After the rework, it would burn oil like nothing I have ever saw before or after! It was quite a spectacle, occasionally she would drive this thing to high school and funnily enough, nobody would accept the offer for a ride! She was probably the only girl in the school who knew how to check oil! The cops stopped her once thinking her car was on fire! There were a few bottles of oil in the trunk at all times. It lasted about 6 months before it burned too much oil to keep a set of plugs in it, to the junkyard it went. The girlfriend on the other hand, is still here now as my wife, we've been together 36 years. She refuses to drive a car that burns oil though.

 

[showcrop]

actually what tractor ? they actually do have a crankcase ventilation , dont know how positive it is. if your blowby is that bad then u need to overhaul the engine. sucking that much gunk back into the intake is not a good idea anyhow, your not going to solve the blowby this way . it is basically to reburn the fumes from the crankcase not to suck blowby sludge , be pretty hard on the spark plugs with added sludge on already carboned up plugs from oil. plus these old tractors dont run hot enough anyhow for it to work with a bunch of blowby. you need to fix the blowby problem with what it takes , like sleeves pistons rings and valves, so the compression is sealed and not leaking past the rings.

PCV, the way I understand it is to put slight vacuum on the crankcase, to help piston movement. This is why pre-emission, we had the control-era device for ventilating the crankcase to the atmosphere; a pipe routed under the chassis at an angle that produces a small vacuum as the vehicle travels forward. Fresh air is drawn in through a mesh filter in the oil filler cap, circulated around inside the crankcase and exhausted through the road-draft tube carrying blowby with it.

 

[Jim.ME]

Has anyone tried to retrofit PCV to an old tractor to solve blowby

I don't see how retrofitting a PCV set up will solve blow by. It would just make it, so the vapor is not visible, as it is when vented to the atmosphere via the common draft tube.

 

[jimg.allentown]

If you have enough blowby to even make you consider this "fix," then your engine is ready for at least a set of rings, and more likely a full rebuild. I've worked on engines my entire life, and I can truthfully tell you that once they are this far gone, there is no farmer fix that is going to make it good again.

Consider this. If the engine has that much blowby, then it is losing compression into the crankcase. That amounts to lost power. The harder you make it work, the more it will blow by. At some point, it will not have enough compression left to start easily or do any meaningful work. That is my opinion.

 

[504]

Just seeing vapor out the vent is not a bad thing. If it is oily dripping and using oil then you should consider a rebuild. Plumbing a PVC valve will hide the problem but it also will lean out the carburetor and could cause burnt valves and holes in the pistons (extreme)

 

[MSD]

We have been doing that on the JD pullers we build. Run a line from the gov. housing up to the PVC unit attached to the exhaust pipe. Seems to work as there is no blowby and it is the only ventilation they have at that point. There is a lot of suction going out the exhaust pipe on one of those.

 

[DoubleO7]

Has anyone tried to retrofit PCV to an old tractor to solve blowby

It does not "solve" blowby but ......
Maybe you need/want an oil catch can? Many are out there made and sold ready made.

 

[olddavid]

You might want to check existing draft tube. Some have a filter box of sorts in the pipe. If it gets plugged the blowby will come out at other more prominent and likely more visible places. Dad had a TE-20 that started smoking like crazy. Cleaning the plugged draft tube fixed it.

 

[Eman85]

It doesn't solve blowby, just reroutes it back into the intake. The solution for blowby is an engine rebuld.

 

[Dingo3]

It does not "solve" blowby but ......
Maybe you need/want an oil catch can? Many are out there made and sold ready made.

I made one of those out of a glass fuel bowl. The engine did not have room for a baffle under the PCV valve. Worked great.

 

[Duner Wi]

Have done twice, One car and one tractor, Solved the visual effects of blowby, not the underlying cause.