RD 28 top end strip

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Yes have done so and come across nothing related to the problem I have, have not posted a request as cannot find my pass word, Rick
 
Latest update, decided that before I start stripping stuff down again that I would like to prove that it is the valves causing the problem, so inserted the hollow glow plug into cyl 1 and connected an air supply, turned the engine over by hand till I got to compression stroke and could hear air from the inlet manifold, as I turned a little further it suddenly became hard to turn against the air pressure, my mate arrived just then so I asked him to listen at the exhaust, but he could hear nothing, I was a bit disappointed at this news as it looked like it may not be the valves but could not explain what else it could be, we could hear air going into the crank case but not a great deal, now my mate was here removed the connecting hose and asked him to spin it over while I hold my thumb on the glow plug, bearing mind last time I did this I could hold it no problem, but not this time my hand was flung with such force it nearly hit the bonnet and even continued to slow the starter down when that cylinder hit compression stroke, after several checks and tests later we lost compression again coinciding with oil pressure, so what happened was the compressed air forced the valves closed so discharging a little oil from the hydraulic cam followers, I have one new follower fitted to the exhaust on No 3 cylinder I now need to devise away of proving if that valve is closing as it should, if it is then I will get a set of followers, if not then I might rig something to test my oil pressure as the gauge is of the electrical type, but also I did have the pump off and checked the pressure relief valve and all was good, Rick
 
Hey Rick, late to the party here but I guess you've checked bottom end is good ? Piston rings , compression test etc
 
Yep all that, it is a hydraulic cam follower issue, am doing a test tomorrow on the one new follower I installed to replace the one I cut open to see how it worked, Rick
 
And so the saga continues, tried the test on the new follower but it was not possible to admit enough gas to make it audible without the resultant pressure closing the valves, so decided to pull the camshaft and modify the pistons in the followers, I did this by grinding a flat with a very fine grade wheel 2 to 3 mm wide, this when reassembled with oil allows me to compress the piston with my thumb slowly compared to having to use a G cramp or vice, so all back together and guess what? no effing different, still spins over on the starter so fast it says there is virtually no compression, one thing I did notice was the lube stalk for the vac pump was for a min or so at idle trickling out sufficient to do the job but as time went on it turned into a jet that eventually hit the bonnet, so now need to seriously look at oil pressure, but and it is a big but, it still starts from cold spinning free and easy, I did do a rudimentary check on the valve springs and got around 60 Kg book says 68 so not too concerned there, and they are not available anyway so I am stuck with them, no think I am going to make them solid followers with probably between 6 and 8 thou clearance, I am effed off with these hydraulic things, Rick
 
Just ordered a load of .2mm hardened steel shims to sort these pesky followers out, update when they arrive and I start to fit them, Rick
 

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Def not cheap I make it 41.86 per valve inc vat plus delivery and import duty, I would never pay that sort of money to those rip off merchants, when I strip it down again to convert to solid followers I will fabricate a more accurate tool to measure the spring pressure, I have found that the 2.4 springs are very similar, but have been unable to get a price and availability from Nissan as they need a reg number to look it up :doh :doh, although I ordered a load of washers I have since found a UK supplier with a better product and they should be here tomorrow, Rick
 
Today removed the cam shaft and converted the followers to solid ones with shims, had it running but not for long as no cam cover on, still cannot fathom the first few mins of running with the vac pump lube spray giving just enough to do the job with a gauge reading of 60 then around 2 mins later it spurts and hits the bonnet, but same reading on the gauge????? Rick
 
It is now proven that oil pressure is holding my valves open, fitted my home made oil filled gauge and first turning over of the day gave me well over 400psi sadly the ball check valve I made did not seal too well so the needle was bouncing around a bit, removed the gauge and ran the engine for15/20 mins reinserted the gauge and barely made 150psi, time to further modify the followers, Rick
 
OK I need to know from other RD28t owners with normally running engines, I will pay you £50 to remove your cam cover and run your engine for 10 mins and take pics of the oil jet to the vac pump, Rick
 
I'm far from an expert on your issue but if the oil pressure is too high and holding the valves open i'd be inclined to think that the pressure regulator for the oil pump is possibly faulty/failing:nenau
 
Good thought Elt but had the pump off and checked the valve when I fist removed the head, all perfect, Rick
 
Rick, I am happy to take some pics for you of the RD28T running if it helps you.

However I haven’t done any compression testing on mine so not sure if you class it as a normal running engine.

If you are happy with some pics of mine then please let me know in detail what you need. As I never had the cam cover off.

I might be able to do it on Monday, they are forecasting snow here over the weekend and the Patrol is the only car that will get us out of the valley after snow.
 
What does yours sound like when hot starting? does it spin over very fast like the injectors are not in, and what oil pressure do you get at a steady 3k revs, Rick
 
Today I removed the cam shaft and have plugged 6 of the 12 follower oil holes, will do the rest tomorrow and run it up for an hour or so with regular re starts, if it cures it then they will all come off again ready for a trip to my mates to do a more permanent job ether with a spot welder or just Tig over the hole, Rick
 
Hot starting is a bit hit & miss. Sometimes she fires up first time but other times it can take up to 5 minutes to get her started. It spins normally when hot or cold starting.

Haven’t got an oil pressure indicator so unable to tell you what oil pressure she runs at.
 
Success well at least partial, my mod to the oil hole in the followers has worked, I have with a hot engine all 6 cylinders at 450psi, pulled it all down again as got to do a permanent fix on the oil plugs rather than the soft solder that I plugged them with as a test, also at just over 3k revs foot to the floor I got more than 10psi boost, never went over 9 before, down side is I still have a hesitation at around 2.5k revs, think that could be the pump, so some tinkering there is called for especially since installing the refurbed turbo I cannot make black smoke, Rick
 
This is my preferred method of blanking the oil hole with a spot weld machine as this will be most kind to the follower heat wise, if it does not work then a quick tig spot will be next best, we will see on Monday, Rick
 

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Upon examining the shim washers that I installed recently they have not faired too well, problem is the bore is 11mm but at the bottom where the shims site it is about 12mm so the shims float about, so came up with this little feller did not take long to knock it up on the lathe got 11 more to do
 

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