336D injectors
- Thread starter Vern
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bruce1966us
Platinum Member
Vern said:
Ym336 has the 3t84 with 84mm bore. The same block was used with 90mm applications also (3t90... john deere 950)
Interesting situation, here now I am back at work where my info is and my manual only shows the 90mm bore specs in section 20 engine repair where I got the info for you.
But in the specs section 10 at the front it lists the 84mm bore for 336 & D and the engine is the 3t84a-n take that with salt too I guess believe it if you see it.
Making the notes in my book right now for future reference.
But in the specs section 10 at the front it lists the 84mm bore for 336 & D and the engine is the 3t84a-n take that with salt too I guess believe it if you see it.
Making the notes in my book right now for future reference.
I am really disgusted - Got The new connecting rod, rings and bearings put in this morning. Head installed compression Gage hooked up - 300lbs. then it would not get over 200. hooked up the air line to it - backed off the rockers- air coming through the exhaust port. I pushed on the top of the valve a couple times - no change. I am walking away from it for a while.
Domush
Platinum Member
Sorry it is still having issues. I think this is 336D revenge day, as my 336D just started knocking some bad while tilling my garden. :sigh:I guess you can take a break while you watch me tear mine apart and cost me a fortune as well
WARNING: If anyone reading this also owns a 336D.. Don't start it up today!
careyo63
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Here's a good Guess #2 cyl. If I remember you sent that head out. Not your Fault. S_ Happens. But again back to replaceing the Rings. You would have known the Rod and would have known of the potential problem. Bent valve Crack in the head etc. If it was one of the grumpy Old men I worked with I would have to take a good look behind me to see how much I had left if that left the shop.Lol. IMO they need to correct the prob.and a new H.gasket. Remember the Squeaky Wheel gets the Oil.
bruce1966us
Platinum Member
I would crank it up and see what you have after it has run for 5-10 min. You could have some carbon under a valve, etc. I think you are almost to be completed with this job.
careyo63
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Carbon build up on brand new valves and a freshly clean vatted head. NO!!!
bruce1966us
Platinum Member
careyo63 said:
I didnt say carbon build up. Carbon, dirt, dust, rust, etc
careyo63
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Your Joken Right? Dirt dust or rust in or on a new Clean Head and cylinder. And big enough to prevent a valve from seating? Come on:confused2:
Being i was so close to getting it running I decided to go ahead and start it up. Ran good, middle cylinder firing and running smooth. After about 30 mins running it developed a knock in low RPM . I tried taking a video bu having trouble getting put on the site. the knock goes away with increased rpm. Seems to have a lot of pressure in the radiator but the pump is working and water is circulating, I did install a thermostat- it did not have one.
I'll keep trying the video
I'll keep trying the video
California
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Thanks for posting that.
It almost sounds like the Yanmar fuel knock in my YM240. You can hear mine if you click on my sig at the bottom of this post, scroll to the bottom of my web page, and play my recording. (especially the second half).
The way your knock fluctuates could be a variance in the quantity of fuel injected, or even early/late timing variance if such a thing is possible.
FWIW I don't see how a rod knock could fluctuate like that - but anything's possible.
It almost sounds like the Yanmar fuel knock in my YM240. You can hear mine if you click on my sig at the bottom of this post, scroll to the bottom of my web page, and play my recording. (especially the second half).
The way your knock fluctuates could be a variance in the quantity of fuel injected, or even early/late timing variance if such a thing is possible.
FWIW I don't see how a rod knock could fluctuate like that - but anything's possible.
Neat 1500
Platinum Member
Mmmm it is quite random, not continuous. i wonder if the fuel delivery on one cylinder is not exact at every injection pulse?
I would re-check the compression after running it for an hour at 1500 rpm let the rings get started seating before condemning anything yet.
The knock to me sounds like fuel or lack of it it is like the knock you get when cracking injectors to find a miss but videos are misleading usually. The fact it didn't have a lot compression in #2 could also be the comp release out of adjustment.
The knock to me sounds like fuel or lack of it it is like the knock you get when cracking injectors to find a miss but videos are misleading usually. The fact it didn't have a lot compression in #2 could also be the comp release out of adjustment.
Last edited:
Domush
Platinum Member
The only time I've ever heard varied knocking like that was caused by poor oil delivery, in my cases caused by worn rod bearings. My butt puckered just hearing that noise again. No engine I've owned ever lived beyond that noise. granted, that is more a reflection of me than the engine
I'd love to be with car doc on this, but I just don't see how rings not being seated could cause knocking. The compression difference, yes, but knocking?
granted, that is more a reflection of me than the engine I'd love to be with car doc on this, but I just don't see how rings not being seated could cause knocking. The compression difference, yes, but knocking?
I have built a lot of engines and most start and run perfect if I did my part but occasionally there is a noise or something that seems out of place that goes away after a brief run in.
If it was carbon/dirt/rust like Bruce said earlier something stuck under a valve is very possible even on a clean new assembly. Air cleaner tubing etc can release this stuff anything before the valve and sometimes takes a bit of running to clear it out.
I hope thats what it turns out to be this is frustrating I have been there done it.
If it was carbon/dirt/rust like Bruce said earlier something stuck under a valve is very possible even on a clean new assembly. Air cleaner tubing etc can release this stuff anything before the valve and sometimes takes a bit of running to clear it out.
I hope thats what it turns out to be this is frustrating I have been there done it.
I used platicgage when I installed the new connecting rod bearings - measured .004 on all three. If I increase the rpm the knocking goes away and the engine runs smooth. I do not have an oil gage, just an idot light and the wiring had been bastardized so not sure that is working.
If it was the bottom end the knock would probably not go away low compression or lack of or excessive fuel causes knock in diesels from my experience.
Like I said to me it seems like a fuel knock but I am not a diesel expert by no means so take what I say on fuel issues with salt. Recheck the compression after a good run in and get back with us on that and I believe we will be able to determine where to look next.
fwtw My engine is pretty noisy (not that bad but...) until it gets fully warmed up and by that I mean an hour tilling etc up until then its noisy but once its warm it has no noise whatsoever and purrs like a kitten.
Like I said to me it seems like a fuel knock but I am not a diesel expert by no means so take what I say on fuel issues with salt. Recheck the compression after a good run in and get back with us on that and I believe we will be able to determine where to look next.
fwtw My engine is pretty noisy (not that bad but...) until it gets fully warmed up and by that I mean an hour tilling etc up until then its noisy but once its warm it has no noise whatsoever and purrs like a kitten.
Vern, here I found you a Jeep diesel that has a knock but its got a cyl down if you listen to him crank it the hitch in its get a long will be noticeable now I mentioned it and its knocking different than yours once it fires off.
I am going to keep looking for just the right way to audibly diagnose a fuel knock and hopefully I will find something and post it.
[ame=http://www.youtube.com/watch?v=Ux9mR-hmguU&feature=player_detailpage]More Jeep noise - YouTube[/ame]
I am going to keep looking for just the right way to audibly diagnose a fuel knock and hopefully I will find something and post it.
[ame=http://www.youtube.com/watch?v=Ux9mR-hmguU&feature=player_detailpage]More Jeep noise - YouTube[/ame]
