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Im about to junk it.

 
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Old 01-24-2013, 11:41 AM
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Im about to junk it.

So as some of you may know I have been doing a lot of work to my Prelude. Running into t ton of little inconvenient problems along the way.
Well Last night the prelude was officially and fully operational. After new bearings and resurfacing the pistons, rings, and cylinder walls. I knew I need to give it time to break back in. So I was riding it ever so sweetly never going over 4500rpms but staying above 2500. And the dreaded noise of engine knock returned. It sounds like its coming from the block and sounds the exact same as when I spun the bearing.
They are brand new with no wear in and the crankshaft and connecting rod both were polished up nicely.
What in HELL would cause this???
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Old 01-24-2013, 11:55 AM
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Re: Im about to junk it.

so this happened while the first drive after the rebuild?

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Originally Posted by Wharton View Post
They are brand new
oem parts or something else?
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Old 01-24-2013, 12:37 PM
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Re: Im about to junk it.

Did you have the engine rebuilt by a reputable builder?

If they set the bearing clearances too tight, its very easy to spin a bearing on a brand new motor since there isn't enough clearance. Which is why I'm setting my bearings a little on the looser side, cuz subby motors are known for spinning bearings.
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Old 01-24-2013, 08:44 PM
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Re: Im about to junk it.

what twoke said

but also, it could be a detonation you are hearing due to an ignition system problem, whats the recent work or tune up youve done for your ignition system if any? if nothing then you might wanna give a look into that, detonation in the cylinder will sound like an engine knock and can also damage the pistons and piston rings severely if not found and fixed asap...

good luck with your problem, that sucks man, hope you find it and get your lude on the road for good, dont junk it.
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Old 01-24-2013, 09:05 PM
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Re: Im about to junk it.

Oil pump ok?

You've come so far bro!! Don't junk it, please.
One thread I read today took 4 years til it ran proper. Another guy has done his engine top to bottom at least twice. Timing being off a bit can really mess things up. Isn't that where your pz story began? A t-belt change?
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Old 01-24-2013, 11:57 PM
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Re: Im about to junk it.

also, when you spun a bearing a first time you may have bent a rod in the process
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Old 01-25-2013, 12:06 AM
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Re: Im about to junk it.

good idea bykfixer, the oil pump could be the cause of the problem, if it was not checked during the rebuilding of your engine, then it could have been the cause of the original knock and the new knock. In case you dont know wharton, the oil pump pressurizes the oil like putting your finger on the end of a hose, the water has less room to pass through, so it pressurizes it and then you get a harder stream that shoots out further, and much faster. If the oil pump fails then it causes the oil pressure to drop severely, like taking your finger off the hose, causing it to not have enough pressure to lubricate the engine like it is supposed to. this causes metal to rub on metal, wear down parts fast, and resulting in what you are hearing, a knock.

if this is the case, you will get an oil light as long as your oil sending unit is operating properly, and also turn the key to ON position next chance you get, and make sure all the dummy lights come on for 2 sec, then shut off, if the oil pressure warning light, or CEL do not come on at all, then you have a burnt bulb and could not have known about the problem....

hopefully that is not the case. because if it is, you are looking at another engine rebuild, or replace. hopefully, warrantied by the shop that just completed it.

the better outcome would be the ignition system which i mentioned earlier.

if your spark plugs and wires, distributor cap have a carbon ring, primary coils, etc. etc. etc. has any unusual or extended wear, and are not operating properly, or if there is to much resistance in the ignition system, then that can cause detonation in one or more of the cylinders, that would sound much like an engine knocking noise. if thats the case, you should still get it fixed ASAP, and not drive on it anymore, because you will be doing damage to the pistons, and the piston rings, however, it will be much easier to test and fix, and a simple DIY job will solve your problem. also a lot cheaper.

so hope its not the oil pressure issue, because if it is, your main and rod bearings are ****ed, and you will not be able to produce significant enough oil pressure to keep other critically important engine parts safe.

hope this helps you figure out your problem, if you need any more help feel free to PM me for info.
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Old 01-25-2013, 12:24 AM
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Re: Im about to junk it.

I'm trying to post but it seems to not let me.
The original issue was a spun bearing.
We think the oil port on the crankshaft was covered up from the old spun bearing so maybe the new bearing didn't get lube so it caused it to spin again.
Everything is good timing is perfect, no more burning oil like prior to engine refresh, connecting rods are good and we have great oil pressure.
I will get back to yall when we check for sure but tonight we needed a break. Keep the ideas flowing theirs a really good chance yall may hit something I'm not thinking of.
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Old 01-25-2013, 01:29 AM
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Re: Im about to junk it.

Don't junk it!!!
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Old 01-25-2013, 04:36 AM
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Re: Im about to junk it.

you need to change oils damn often after those kind of operations. first after 60 miles, and couple of times soon after that too before you can put good oils there and drive normally
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Old 01-25-2013, 02:29 PM
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Re: Im about to junk it.

I didn't get 60miles I got maybe 15 before this happened.
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Old 01-25-2013, 10:01 PM
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Re: Im about to junk it.

did you do the rebuild yourself? OEM or OEM Quality products? trusted brands?

did you ever check the ignition system yet like i mentioned? its more than just the timing.

check the spark plugs, wires, coils, distributor cap, rotor, contact points, etc, etc.
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