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Tatra 912-2 upgrades!

cranetruck

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EZFEED said:
........
Thank you immensley for this!!!!!! :D I just ordered 6 of the ball valves, some threaded and some with the barbs so that I can use them on the oil cooler on my other truck!
Check valves and other valves can be tricky, make sure the flow factor (Cv) is high. There is a rather simple formula for figuring the pressure drop across a valve based on Cv, flow rate and specific gravity of the fluid.
Specific gravity changes a lot with temperature of the oil, so it may not be all that straight forward.
Most valves are also not very dirt tolerant, so placement of the valve(s) with respect to the oil filter is another factor....
 

nf6x

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EZFEED said:
OH............MY..........LORD!!!!!! :shock:

Thank you immensley for this!!!!!! :D I just ordered 6 of the ball valves, some threaded and some with the barbs so that I can use them on the oil cooler on my other truck!

No problem! McMaster's prices can be quite high, but they still get my business a lot because they have such an excellent search tool, and I usually get stuff the next day by ground shipment. I think they have a UPS depot built right into their nearest warehouse, which is just one county over from me. Things take a little longer when they have to be shipped from their other warehouse. I've bought lots of stuff like grade 8 hardware from them, because they have exactly what I need (at a high price), as opposed to bins of picked-over and mixed-up stuff at the auto parts store. Now, if only they carried hardware with OD chromate coating instead of the gold chromate! :)
 

EZFEED

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Oh crap.......

I do know the green warning light requires 0.5atm to make it burn. This light and the oil temp gauge are the only two oil sensors that I have available to me in the cab. The light is actually a reverse dummy light in that it comes on after oil pressure is created past 0.5atm and glows green (for go) as long as pressure is present. I know ths is working correctly too cause I just had an incedent where I ran about 10 miles to the hardware store to pick up some wood and on the way home had a spike in oil temp and the light cut off. I was fiddling with something on the left side of the engine and forgot to reconnect the scraper actuating cable :oops: so I had to pull over and manually do it twice. I had just poured a few quarts of diesel in the crankcase to get it clean and all of the crap was breaking loose and plugging the filter as it warmed up.

Let me run this by you.....

I am thinking about machining an aluminum spacer block to sandwich in between the filter housing and block and using this to tap into the oil ports. There are two chambers in the oil filter housing, the first onethe dirty oil is pumped into is where the labyrinth filter is housed on its spindle. Below the filter is a fairly deep sump where the scrapings are supposed to go. After oil passes through the filter is travels inside the filters cavity and into a secondary chamber where it is directed upwards back into the block to be distributed. In this secondary chamber the oil temperature and pressure information is taken before it travels on. In the event that the filter becomes plugged or the scrapers fail to clean the oil is directed to the top of the first chamber just above the filter to where a poppet ball valve s located and unfiltered oil is allowed into the galley the clean oil was supposed to flow. In such an event the light would go out and the temperature would drop.

What I'm thinking about doing is either:

1. Drill into the top of the oil canister under the engine and istall a pickup tube, from there run a line back ot the 12V oil pump and then back to the filter but tap into the spacer and tie into the DIRTY oil port so that I when I flip the switch the pumped oil will flow into the first chamber, be filtered, then flow to the oil galleys in the engine. I would install one of the McMaster check valves in the aluminum spacer where I tied into it so once I cranked the engine the oil will not flow back through the line to the 12V pump. I would also install a ball valve at the bottom of the pickup tube to prevent oil from draining back so that when I change the oil I dont have an empty line of air.

2. Tie into the clean oil port through the spacer and suck clean oil from the filter housing. There are check valves in the engine to keep oil in the pump and lower engine, the oil would be sucked from the oil canister under the engine then through the bypass in the engine pump and then through the filter and into the suction line. I can run a line then from the spacer, to the 12V pump, then to the two oil ports in front of the engine and pump oil directly to the valvetrain.

Can you tell me what psi I would need going by the 0.5atm needed to make the green light burn or would that just be a minimal pressure?
Any better ideas cause I'd love to find a simpler way and you are the guru on this!!!! :D
 

cranetruck

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Atmospheric pressure is about 15 psi (which is also called 1 bar on many European style pressure dials), so 0.5 atm is about 7 to 8 psi....

You did change the oil after adding the diesel, right? Diesel in the oil will lower the viscosity, lower the pressure and reduce the lubricity.
 

EZFEED

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Sure did, I just ran it to clean the crud out and after that day I changed it and put fresh 15W40 with a couple quarts of Lucas additive. It sure did do a good job of cleaning it though....I got allot of sludge out.
 

EZFEED

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Re-plumbed the injection pump yesterday. All did not go well..... :x

I discovered that you cannot re-use the little aluminum sealing rings for Banjo fittings and especially not when you've mixed them all up from the connections they were originally on. I had several nice unstoppable fountains going on when I cranked it up. It was off to find new sealing washers now.

I looked, and looked, and looked all over town today and finally found one place that had them...only thing is the ones they had were copper and were allot more expensive than the regular aluminum ones. I've purchased them before out of state but in this case we’re talking a difference like $0.20 each for the aluminum versus $1.75 for the copper. I DO NOT GET THIS......
Like a fool I left my wallet at home and only had a $20 bill on me because I fully expected it to be way under that. Luckily the guy had a heart and sympathized with me and found a bunch of unused ones that were extras from old rebuild kits. I gave him the $20 and happily got the h*ll out of there, today or tomorrow I will re-plumb and see what happens and repost pics or maybe even a video? :roll:
 

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kcimb

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Elwenil

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Ok, I have a question. On many of these I see a little antenna looking thing on the edge of the fender beside of the headlamp with a little ring at the end. Is that some sort of guide or something?
 

EZFEED

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Elwenil said:
Ok, I have a question. On many of these I see a little antenna looking thing on the edge of the fender beside of the headlamp with a little ring at the end. Is that some sort of guide or something?
Just clearance markers/guides for when you get in a tight spot and need room to turn or maneuver. The long one without the ring on the passener side is for the left side view mirror and the other one on the right up close to the cab is for the right side view mirror.

:lol: *Fender whiskers!* :lol:
 

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EZFEED

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Got some pics of the oil filter Bjorn! It was leaking a little too so just more reason I was tickled to take it off! :lol:

You can see the relief ball valve and the inner labyrinth filter and scrapers.
 

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EZFEED

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Can anyone chime in with information about grafting turbos onto naturally-aspirated engines? I dont know if its possible but if it would be worth it power wise I'd like to put this extra D turbo I have sitting around to use.
Is there any danger to doing this? The engine only has 300km on it so it's still new, would the extra revs tear the roller bearings up on my mains?
 

cranetruck

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Interesting bit about the oil filter. Here is the internals of the scraper type filter used on the xm757, which has a micron rating of 50 (primary fuel filter and also serves as a water separator). It was selected to reduce maintenance, one turn of the handle did the job and draining.

Adding a turbo to a N/A diesel engine should not create any problems, but will require a dedicated lube line from the oil gallery. It will not increase your rpm, only provide more air, which makes it possible to increase the fuel rate and hence power output.
 

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EZFEED

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cranetruck said:
Interesting bit about the oil filter. Here is the internals of the scraper type filter used on the xm757, which has a micron rating of 50 (primary fuel filter and also serves as a water separator). It was selected to reduce maintenance, one turn of the handle did the job and draining.

Adding a turbo to a N/A diesel engine should not create any problems, but will require a dedicated lube line from the oil gallery. It will not increase your rpm, only provide more air, which makes it possible to increase the fuel rate and hence power output.
Sweet! I am totally new to these kind of filters but I like the ingenuity of them and surely like the fact that it requires no consumable parts. I'd like to keep it if possible.

So where does this mount on the XM757???? Is this in the cab somewhere handy?

Looks like I will be experimenting with this turbo after all :wink: As for the oil line, this is no problem, I can run a line from the spacer block to the turbo with no problem. I'd like to find a way to safely experiment with this and install a wastegate somewhere. Dont know if the D turbo puts out that much but I'll find some way to dump the excess in case something happens.
 

EZFEED

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Havent been able to do much work on my Praga latley guys. I've bought all of my lighting stuff but its been sitting in my shop. I've been working non-stop pretty much since my last post here with only a few days off here and there.

Yesterday I began to prep for the job though. Slid the 30mm twin cannon turret off the back and started cleaning up my shop to make some working room. I ended up throwing out two pickup truck loads of junk.:roll:
 

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EZFEED

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Sis came by saturday while my little bro and I were outside working pulling trees around to the burn pile and she made some videos while there. Some of while we were working and some just before we left to go eat in lafayette.

Wish she had come 20 minutes earlier. Y'all could have seen us move a tree for the neighbors. He had a 40 or 50 foot tall water oak that fell during Ike that was a shy over 5 foot in diameter at the base and his tractor wouldn't budge it so we hooked the rear winch cable up to the trunk and pulled it sideways as close to the truck as possible then I engaged all 10 wheels and drug the whole sucker across his property to his burn pile. The truck didn't even snort under that load, was like nothing was back there.

Here ya go.......
http://smg.photobucket.com/albums/v425/EZFEED/Videos/?action=view&current=DSCN0164.flv

http://smg.photobucket.com/albums/v425/EZFEED/Videos/?action=view&current=DSCN0165.flv

http://smg.photobucket.com/albums/v425/EZFEED/Videos/?action=view&current=DSCN0166.flv

http://smg.photobucket.com/albums/v425/EZFEED/Videos/?action=view&current=DSCN0167.flv

http://smg.photobucket.com/albums/v425/EZFEED/Videos/?action=view&current=DSCN0178.flv

http://img.photobucket.com/albums/v425/EZFEED/My%20vehicles/DSCN0177.jpg
 

EZFEED

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I also dropped the oil pan on my truck and took some video and pictures of the guts. This is a new engine but I wanted to double check the torque on the rods and crank “just in case” some lazy Czech mechanic decided to take a shortcut.
Wonderful piece of engineering, everything is on roller bearings, even the mains which are HUGE J

http://smg.photobucket.com/albums/v425/EZFEED/Videos/?action=view&current=Picture056.flv

http://img.photobucket.com/albums/v425/EZFEED/My%20vehicles/Picture037.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture038-1.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture039.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture040.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture042.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture043.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture044.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture045.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture046.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture047.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture048.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture049.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture050.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture051.jpg

http://img.photobucket.com/albums/v425/EZFEED/My vehicles/Picture052.jpg

 
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