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What are the pros and cons of running no water in the block 504" sbjd, no intercooler with 3.9" Holset on. I understand there are tractors out there running dry block with an intercooler but can I run dry block with no intercooler safely ? Eventually we would plan to have an intercooler.
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pistnbroke
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Just to reply with the answer to all the bearing failures for 11 years - We went back to the drawing board and looked at everything we had ever changed/swapped etc, the only two remaining items from 11 years ago were the balancer and the Oberg filter. So, phone call to Phil at riverside - please send a suitable balancer and oil filter (system 1)
which we duly fitted 18 months ago and have never
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pistnbroke
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Hi All
Thanks for all help, i have just fetched a replacement part made by my local guys Agra Engineering.
Hardened to 55 Rockwell.
happy pulling everyone
Still no reply from tom urmson
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pistnbroke
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two messages left now. tried at 3am GMT (yawn) and left a previous message. It will be less stress to get one cut here !
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pistnbroke
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thanks guys, best set the alarm for 3am to call from the uk !
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pistnbroke
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Hi all, as you can see in the attached photos we have broken the shift coupling on the input drive shaft on our JD 4430 prostock with Urmson transmission. I am having trouble identifying which JD part to order. Can anyone help identify this coupling ? I am not sure which gearbox to look at on JD parts. The ID tag is gone from the casing.
OD = 4"
ID = 3"
Selector fork track width = 0.27"
25 t
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pistnbroke
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alex@nethertontractors
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pistnbroke
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Hi RPM wobble. Thanks for your time and info.
Crank back from grinder last night, turns out, I gave wrong info on clearances. Correct clearances are 3 and 4. No 5 big end is now -20 and the rest all received a polish.
Engine is 466 with a stroked crank running 504" in Pro stock class, with 13mm p pump, crane roller cam, standard fuel, big valve head, standard diesel, 4.1 hypermax turbo.
I
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pistnbroke
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Hi RPM wobble- thanks for info. Thrust oil feed is only drilled on clutch side as you suggested and there is plenty of end float available on gearbox input shaft and crank when connected. Crank journal clearances are 2 & 3 thou as standard on this engine, is this enough ? we have been there before and ripped the bearings out as well. The most success we have ever had is with larger clearances alb
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pistnbroke
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light spring to try and relieve excess oil pressure
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pistnbroke
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after discussion with a friend last night- I have drilled into the main that carries the thrust washer to get oil onto thrust washer, could this be where we are losing pressure? we are also utilising piston spray jets. Maybe there is not enough pressure left to feed the big end with spray jet, thrust feed and big clearances?? just thinking?
thrust oil feed is 2mm
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pistnbroke
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Hotsmallblock- never use ether after breaking a piston on a great going old ford years ago. Heat up the water and put propane torch in the air intake- much smoother start.
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pistnbroke
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funny- sorry, not sure what you mean ?
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pistnbroke
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interesting on the pump relief spring. we do run the light spring but have no data recorder. Also interesting is that the Oberg might not flow enough oil at higher rpms ? This is all beginning to make food for thought. a simple oil pressure data recorder would be good I think. As for the Oberg bypass- we have been wrecking bearings for years before closing off the bypass with no noticeable diffe
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pistnbroke
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Aviaid guy definitely said 'too high oil pressure is a myth' they have race engines running 300psi!
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pistnbroke
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I reply to the last few posts- Oil is Kendal 20/50. There is no oil bypass on the engine, oil goes straight through a 1 1/2" supply hose into the gallery which has been washed out to allow better flow. Oberg filter bypass is also locked off to cancel any unfiltered oil entry.
According to Aviaid pumps people there is no such thing as too high oil pressure, there words not mine! Have burst a coup
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pistnbroke
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clevite
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pistnbroke
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alex@nethertontractors
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pistnbroke
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Broken........ that's just me ! just started our 11th season with a 466 JD and have bearing trouble again!!!!!!!!! grrrrr! It has occurred to me that the one part remaining unchanged during all this time is the harmonic balancer, could this be causing our bearing failure every time we go down the track????
Has anyone had similar experience? Line bored, girdled, small pin rods, stroked cr
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pistnbroke
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yep, davey and i had a good chat about stuff. He also thought it would be good to speak to phil @ riverside. Thanks everybody!
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pistnbroke
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All good feedback guys thanks. I seem to have had best success with larger clearances, but iam no expert and i take on board what you are saying which agrees with the crank grinding people here in scotland who also think i am running too high clearance and to high oil pressure! Maybe crank flex is also an element as Derek suggests. There was another uk 466 deere had years of trouble without findi
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pistnbroke
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thanks, planning to make the call tomorrow.
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pistnbroke
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No counter weights on crank.
Have tried original block with steel mains and aluminium girdle, then tried a 20mm steel girdle all properly machined line bored and de-stressed. Now on to latest block with original mains, aluminium girdle and spacers!
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pistnbroke
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this is all interesting! ariad pump guy said too high oil pressre is a myth! they have funny cars running 300psi! that is what he said when i called!
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pistnbroke
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maybe i wrote the size wrong ? 6 thou was what i meant.
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pistnbroke
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ok will do thanks. running kendall oil as well. 8" oberg filter. Ariad 3 stage pump with small section on fuel and both big sections feeding straight into oberg with one 5/8 pipe feeding direct into main oil gallery. very high oil pressure on start up even with light spring in pump relief, have burst a couple of obergs in the past because of this, but when oil is warm pressure seems to run as men
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pistnbroke
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Hi, looking for some guidance after years of bearing trouble in my stroked (504) 466 JD prostock. every time up the track results in at least one bearing giving in. not always the same bearing, mostly mains but not always. oil pressure runs approx 120psi at start of run at 5500rpm. Bearing clearance = 0'006'. Fitted new block and crank last year from respected engine builder, this did
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pistnbroke
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