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Noise After Rebuild...

meet07

By meet07,
in Engines & Forced Induction

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STATUS Grand Master

STATUS

Posted
Posted

Besides the knock, you need to space the Cas away from the cam, or it will break the keyway, and stuff the cas

generally once its cut the back of the cas it will flutter the timing up top... really commo issue.

Good spot Adriano

abr33 Proficient

abr33

Posted
Posted

when you spun the engine over to build oil pressure did you have spark plugs fitted to the engine?

Recon it'd matter much? provided it wasnt assembled dry, shouldnt hurt as far as i know. plugs out is probably safer though dont think it'd matter

I really think its a lifter not bled or stuffed, listen to the knock speed, to me it sounds too slow to be crank speed.

SOLUTION to find out, use timing light, does the knock have the exact speed as the flash of the light? if so, its cam/lifter/valve problem. If its twice as fast as the flash you have a bottom end problem

SargeRX8 Grand Master

SargeRX8

Posted
Posted

Recon it'd matter much? provided it wasnt assembled dry, shouldnt hurt as far as i know. plugs out is probably safer though dont think it'd matter

I really think its a lifter not bled or stuffed, listen to the knock speed, to me it sounds too slow to be crank speed.

SOLUTION to find out, use timing light, does the knock have the exact speed as the flash of the light? if so, its cam/lifter/valve problem. If its twice as fast as the flash you have a bottom end problem

I was going to suggest he do something like this but with the injector on 5 and 6. Listen to the injector clicking open then see how that correlates with the head. If it is a bearing in the bottom end it will thud of every cycle, if its the lifter it will only thud on the exhaust or intake stroke or how ever the f**k it works.

Girorostar Experienced

Girorostar

Posted
Posted

I had that exact same noise when i rebuilded my engine. I told my mechanic to check the timing again if its not that to pull the engine apart again, not sure what he did though but a week later the engine was running fine and no problems 2 years later now. I'll give him a call and ask what he did. I didnt have to pay a lot extra so i dont think he pulled the engine apart again.

meet07 Enthusiast

meet07

Posted
  • Author
Posted

is it running oil restrictors in the block? ive seen the same thing when the builder run restrictors in both galleries.

I bought some Tomei restrictors to install but after doing some reading on hydrolic lifters there was no need for them so I sold them...So no restrictors installed..

meet07 Enthusiast

meet07

Posted
  • Author
Posted

Recon it'd matter much? provided it wasnt assembled dry, shouldnt hurt as far as i know. plugs out is probably safer though dont think it'd matter

I really think its a lifter not bled or stuffed, listen to the knock speed, to me it sounds too slow to be crank speed.

SOLUTION to find out, use timing light, does the knock have the exact speed as the flash of the light? if so, its cam/lifter/valve problem. If its twice as fast as the flash you have a bottom end problem

off subject a little with the CAS issue....I would think that if it had something to do with the CAS that the noise would be heard from the front but there is a spacer between the CAS and the aluminum bracket...

abr33: I will try this trick when I get home this afternoon...I assre you that the lifters where bleed. seperated them all, submerged under a clean bath of 10w-30, paper clip inserted in the center of the ball and pumped up and down until all the air was released. What does a collapsed lifter do b/c after bleeding they all where solid...

meet07 Enthusiast

meet07

Posted
  • Author
Posted

a while ago i hear a very similar sound on friends SR that was rebuilt, turned out to be the gudgen pin i think thats how its spelt? found out after the piston went through the head

That gudgen pin was in place. Wiseco has a "C" clip on both sides that keeps it secure. When I disassembled the bottom end after the 1st rebuild all the pins where secure and there where no marking on the cylinder wall....A piston through the block would not be good.....lol

meet07 Enthusiast

meet07

Posted
  • Author
Posted

I forgot to run spacer on my cas to once killed it in 5 min lol, it started grinding against the cam gear.

Yeah and the motor has been running for more than 5 minutes so no cas issues....I would hate for that to go b/c its would be rather hard and expensive to replace that mate...lol

meet07 Enthusiast

meet07

Posted
  • Author
Posted

I had that exact same noise when i rebuilded my engine. I told my mechanic to check the timing again if its not that to pull the engine apart again, not sure what he did though but a week later the engine was running fine and no problems 2 years later now. I'll give him a call and ask what he did. I didnt have to pay a lot extra so i dont think he pulled the engine apart again.

Hey mate I would really appreciate it f you did that....

meet07 Enthusiast

meet07

Posted
  • Author
Posted

Its about a 4mm spacer for the cas. lol made that mistake when I was 18!

Use a stethascope or long screwdriver to try and pinpoint where the noise is coming from...

Definetly intake side under the valve cover cylinders 5 and 6, possibly exhaust side as well on cylinder 6

abr33 Proficient

abr33

Posted
Posted

off subject a little with the CAS issue....I would think that if it had something to do with the CAS that the noise would be heard from the front but there is a spacer between the CAS and the aluminum bracket...

abr33: I will try this trick when I get home this afternoon...I assre you that the lifters where bleed. seperated them all, submerged under a clean bath of 10w-30, paper clip inserted in the center of the ball and pumped up and down until all the air was released. What does a collapsed lifter do b/c after bleeding they all where solid...

You dont really even need to bleed them. I didnt know I had to, started it, sounded like a milo tin full of bolts, ran it for 5 mins, next day quiet as a mouse.. They self bleed. You may have a little bit of shit or cotton or aloy or god knows what clogging the little hole for a lifter. Let us know :-)

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