What is cylinder liner protrusion on Y485?

[Bob Rooks]

Your theory has merit for sure and a tiny bit of H2O could increase the combustion also. Just my 2 cents but I believe I would be suspecting a casting flaw in an area the MagnaGlow could not be seen under that #3 valve. Exhaust
or intake?

What little coolant would be introduced during the intake stroke would be flashed off in the flame front during combustion. If there was an increased amount you would see white exhaust smoke that dissipates quickly. I have witnessed casting flaws that will open under heat and close when cool. Rare, but not uncommon.

 

[Tim Berframe]

In the photos, I am measuring directly the old one and taking scaled measures off a photo for the new one. The old one has the smaller diameter edge that amounts to 0.718cc. That is what had me thinking the compression might be higher with the new one. With a stroke of 90mm, the 85mm new piston has a displacement of 510.45cc (ignoring the butterfly shaped cutouts on the top of piston). The old one would be 509.7cc. Seems trivial to me but I'm not a mechanic - I just play one on weekends.

 

[Tim Berframe]

So, based on your observation of the relative amount of water that has been in #4 to #1, I consulted the engine rebuilder. He loaned me some tools and my chore today is to rule out some low chance possibilities and then pinpoint location of fault:

1 Check Calibration of torque wrench
2 Do a compression check. He suggests that it should take a lot of over compression to cause gasket failure so fast (like 500psi) Little chance the small piston size diff is causing this.
3 Pressurize the water system with compressed air. Pull the glow plugs and turn over. Look for water vapor to lock down where the problem is. Pull head. Punch out the swirl chamber splice block on probable cylinder and redo magnaflux to see if casting flaw in there. OR rig up a pressure test with compressed air and try to determine a leak.

Im fearing there must be a internal crack at this point. There doesn't seem to be a replacement head for sale in China or N America.

Ill let you know how it goes...

 

[Rgladden]

blocking and sealing all the ports and bolt could be daunting challenge not mention a heavy enough section to simulate a engine block but one cylinder at a time may be more doable. My thoughts lean to water vapor not water entering the chamber my power plant experience taught me that H2O at 1000' F is no longer water (just plain old BTU's) and difficult to contain.

 

[Bob Rooks]

blocking and sealing all the ports and bolt could be daunting challenge not mention a heavy enough section to simulate a engine block but one cylinder at a time may be more doable. My thoughts lean to water vapor not water entering the chamber my power plant experience taught me that H2O at 1000' F is no longer water (just plain old BTU's) and difficult to contain.

Depends on the operating pressure. Power plant boiler water is usually treated with Amerol and Amerzine, or equivalents. This tractor's coolant is probably treated with ethylene or propyline glycol. The last plant I operated was 600 psi and 750°F superheat "invisible steam". What plant runs 1,000°F superheat? A Boomer? Although there are SC and USC steam plants that run at around 3,000 psi and 1,000°F where the boiler feedwater is instantaneously flashed into a gaseous state.

 

[Bob Rooks]

So, based on your observation of the relative amount of water that has been in #4 to #1, I consulted the engine rebuilder. He loaned me some tools and my chore today is to rule out some low chance possibilities and then pinpoint location of fault:

1 Check Calibration of torque wrench
I'm sure the torque wrench is fine, at least within 3 lbs.

2 Do a compression check. He suggests that it should take a lot of over compression to cause gasket failure so fast (like 500psi) Little chance the small piston size diff is causing this.
Agreed. From what I see I don't believe this is the problem.

3 Pressurize the water system with compressed air. (Do not exceed radiator cap pressure, you could blow coolant pump seal) Pull the glow plugs and turn over. Look for water vapor to lock down where the problem is. Pull head. Punch out the swirl chamber splice block on probable cylinder and redo magnaflux to see if casting flaw in there. OR rig up a pressure test with compressed air and try to determine a leak.

Im fearing there must be a internal crack at this point.
Cat had a real problem early on with precombustion (swirl) chambers sealing. Don't rule out resealing if no cracks found. There doesn't seem to be a replacement head for sale in China or N America.

Ill let you know how it goes...

1234567890

 

[Rgladden]

Yes its Coal fire "Super heated" with 3200 PSI at the throttle valves., 750 MegaWatt units.

 

[Affordable]

Well apparently you have not checked with us, we do have New replacement heads for the Y485T Swirl chamber in stock in Bellville,Texas. We bought up the last ones the Yangdong factory had we are the only ones that have any . They are not complete heads , you have to put valves ,seats, ect.We have all those parts too if you need them

If you want one give us call 979-865-4002

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company
979-865-4002

 

[DLTTrekkers]

I did have a Y495 that after stripping all of the engine I found that it had a block leak between the block and the sleeve.
I had to get another block and rebuild the engine.

 

[radios1]

try a double gasket, see what happens, I don't see complete sealing on the head to gasket interface.. you did tighten the head bolts to the proper sequence, using the proper torque, right?..