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Papay

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Papay last won the day on June 3 2019

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About Papay

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    Scott

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  1. Ran fine this morning on the way to work, just have to keep it alive with the gas pedal for the first minute or so. Interestingly, the cold behavior was better with the leaky secondary. I'm wondering if there could be a happy medium to be found, unfortunately the secondary is not really adjustable. Looking at it, the only thing controlling its position is a metal-to-metal cam profile in the linkage. Kind of cheesy. Maybe with some careful bending I might get it to open just a hair instead of fully closing. Another option would be drilling a small hole in the butterfly, but that's kinda permanent if I get it wrong.
  2. We have taken a few trips that were 2-3 hours duration, and the van has been flawless. Plenty of passing power, and incredibly smooth pull at low RPM in 3rd or even 4th. Now I'm excited to move ahead with the dual electric fans and hopefully ditch the clutch fan. Combined with the future exhaust system I have in mind, I'm looking forward to actually being able to hear the engine instead of the fan. Today I re-torqued all the critical bolts, the manifolds had all loosened a bit. Reset the rocker clearance, which had all tightened a bit, wasn't expecting that. Plugs look really good except for #4 had oil on it (which has been ever since I've owned the van). Have enjoyed the cooler running temps, and have not added a drop of water after the initial run-in fill. I'm going to cleanse the system now and go back to coolant, and reinstall the thermostat. Before the new head, it was losing so much water there was no point wasting money on coolant, and the thermostat would get too much scale to function properly. Incidentally, the VLT ceramic paint is holding up really nicely on the manifolds. First time I have used the stuff. Wife wasn't thrilled about baking parts in the oven, think I may need to get my own oven in the shop....
  3. May have solved this. I had the carb off today and found a little grain of something that was holding open the secondary just a crack. It had kind of glued itself to the wall of the throat right where the butterfly closes. After assembling and reinstalling, it was back to its normal low-low idle behavior. So I cranked in the idle stop and added a half-turn on the idle mixture screw (no choke remember).
  4. Took a video, can't figure out how to make it a gif. Anyway here you can see all the new stuff. Ordered actual Toyota part numbers for all that stuff, but I feel it was worth it.
  5. That's the 'before' photo haha, no I got all new bolts remember. There is no leak anywhere in that intake system, and since the mystery behavior also happened before my cylinder head swap, its gotta be in the carb somewhere. I had another thought while falling asleep last night: something sticking in the secondary. Both times this has occurred have been after heavier acceleration. Anyway this morning I'll poke a bit before heading out, and snap a recent pic!
  6. On my carb that solenoid is in a threaded bore. About a week before I posted this, I had found the solenoid wasn't tight. So while I had the carb off for cleaning, I went ahead and tightened it. I just figured it being loose couldn't be good, but at the time there was no idle speed issue. Since posting this in early December, I have replaced the cylinder head, along with intake and exhaust manifolds. I checked over the carb while I had it off, and removed a couple of linkage pieces that were still in place from the choke mechanism. Just in case the little tooth cam was interfering with the throttle linkage. To be clear, I don't have a choke plate at all, the entire choke system is removed owing to the warm climate here. After getting her all back together with the new head, idle speed was normal. I figured it must have just been an air leak somewhere, and now everything is new and tight and fresh. Then today it happened again, exactly like before. Driving along, come to a stop and now the idle speed won't return to normal. I poked around to check for loose hoses and the like, but its all as it should be. Tomorrow I'm going to experiment with unplugging the idle solenoid, and bypassing the little bi-metal valve there on the side (the rectangular thing).
  7. Mission accomplished! Engine is butter smooth, all the chuffing is gone, along with the random surges and hiccups. Quiet, powerful, wow I'm stoked! Huge thanks for the words of advice and recommendations.
  8. Drove to the exhaust shop this morning with an open exhaust. Had tried unsuccessfully to get a downpipe made before the dual plane exhaust manifold was installed, but they had to use a good bit of guess work, resulting in the pipe pointing out to the side about 30 degrees haha. The chop jobs done here on exhausts are frightening to look at, so this particular setup is just temporary. Now I'm onto drawing up a flange to get it laser cut in stainless. Gonna order the proper sized stainless pipe sections and maybe weld it up myself for better results.
  9. Def interesting how Toyota seems to have provided different combinations in different markets. These pistons have a slight concavity, so I wouldn't call them flat per-se. But as you say, seems to be designed to work with the dished head. Now other 5k's in the AU/NZ market seem to have been build with dished pistons and a flat top head I guess.
  10. Listed as .2 for intake and .3 for exhaust (cold). I got them set yesterday with no trouble. I used a little bit different method to compress the lifters: since getting all 8 pushrods located on the rocker ball was a bit tricky, I dialed out the clearance before the rocker stands were fully seated, and before the head was fully torqued. My logic was to let the head bolts do the work. Then I went around one by one and backed them off to the proper clearance. My recollection of previous hydro engines though, is that there was zero lash adjustment. Then again, that was an Oldsmobile. In the pics you can see #1 with the exhaust valve compressed. Rocker geometry seems fine to me, but I'd like to get extra eyes on this. In the other pic you can see my pistons, which were not the dished type I was expecting. I cleaned most of the gunk off and ran a wire wheel through the top of the bores just checking for cracks and ridges. Didn't find any. Block seems to be in good shape, I gotta say Toyota impresses me (this being my first one).
  11. Pulled the head again this morning, drilled the two offending holes oversize and re-tapped them. I was a little iffy about doing it with a hand drill, but it worked out fine. I had my old head to practice on to make sure I wasn't going to bugger up the new one. So now the rocker stands have 4 bolts and 4 studs. It is what it is. I'm torquing down the rocker stands right now and setting the initial rocker clearance. It occurs to me that all I have to do is check each rocker in the closed position, to make sure there is no clearance. Should be simple enough to rotate the engine through a few cycles until I can get each valve to close. The hydro lifters will pump up and do the rest. If I'm measuring right, the old head was 3MM thinner! Now I'm feeling nervous about these pushrods. They measure 186mm, I'll throw up a picture here in case it looks wildly off to some of you. This is my first K motor, so I don't have a comparison. EDIT: Ok there is a little sticker in the fender well specifying intake and exhaust clearance, so I will follow that.
  12. Hit a snag. Two of the 8 rocker stand threads look like they had been previously stripped and maybe heli-coiled. Did not notice this on disassembly, and they tapped normally when I ran the taps into all the bosses. Now they will not hold the torque of the bolts. Went to all the normal parts shops here and no-one has even heard of heli-coils. So it looks like I'm going to be drilling these oversize unless I get a better suggestion. Fortunately, the old head I removed had 4 such oversize studs....maybe this is a common problem in these engines. Sucks though, I should have installed the rocker stands prior to installing the head.
  13. I had the shop weld up 4 of the holes in the head where the new gasket had omitted the passages. But the block will have to wait until later. I'm planning to pick up a spare and rebuild it for when its needed. Regarding rocker adjustment, my engine is a 5K, but the rockers look like this. Actually both heads I have are like this. So I'm assuming there must at least be a zero-lash adjustment needed, even though the forum here seems to indicate that only mechanical lifters have adjustable rocker gear.
  14. Bless you for posting the rocker stand and manifold torques. I couldn't find them anywhere! As far as the block, no it is still in the van, this is just a top end job only. Old head was totally FUBAR.... not only were most of the passages at the block stopped up with dirt and scale, the aluminum had corroded right up to the edge of the cylinder chamber in a couple of places. One corner of the casting itself around the front left head bolt (the exposed bolt) was either broken or corroded off as well down where it meets the block. Before I got started I procured the necessary taps and dies, so I have been re-tapping all the critical holes as I go. Its amazing how much crap is down there. Earlier we had discussed the 2-3mm step in the chambers of this cylinder head. The shop ended up shaving it twice, totaling about .75mm so I still have plenty of relief in there. Now here is what is interesting: Both this head and my old one have a casting mark '100'. The old head has been shaved much more, you can barely see the former step in a few places. This is interesting because of our discussion about the pushrods.....knowing the mechanics around here, I can almost guarantee whoever worked on this engine before just re-used the stock pushrods. So at least with this newer head, it should take me a step toward correcting the rocker geometry rather than making things worse. Gonna take some measurements today during install. I need to dig through here and find the rocker adjustment procedure.
  15. Update, have the head ready to install. I went ahead and refurbished an intake manifold and dual plane exhaust mani, including all new hardware. Pulled the old head today, man what a mess. It was corroded between the water passages and the edge of the cylinder chamber in a couple of places. Right now I am searching for the torque spec for the head bolts. A word of advice regarding heads and intake manifolds. My ports in the head were at least 3-4mm smaller than the intake. Now, I did acquire them from different sources. They aligned perfectly to the bolt holes and guide pins, so its possible that Toyota used different port diameters in different years or markets. I took the time to make my own gasket and port match everything to ensure perfect alignment. The exhaust lined up rather well. But there again, the off-the-shelf gasket I originally bought was absolute rubbish, blocking at least 4mm of the exhaust ports. Hopefully the homemade gasket will hold up. I used the 'proper' material as recommended by everyone around town. Being Philippines, I'm keeping my fingers crossed.
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