Installed new engine today, think that I might have an Exhaust Leak.

[Reziel_1983]

Originally Posted by INSIDIOUS '86

sounds like something isnt right in the valvetrain, did you use break in oil for the engine?

We used Delo 15w-40 for it. That is what our machinist told us to use.
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[Reziel_1983]

A mechanic came over today and told us that the deep sound was a main and the higher pitch was.something outside the engine scraping. Pulling the motor out again now.
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[Reziel_1983]

Another thing to add is that these noises have been heard since the moment the engine fired up the first time.
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[INSIDIOUS '86]

wel delo even has lower zinc levels now so thats why break in oil or zinc additive should be used exclusivley for the engines to survive the first ten mins of break in

if the main bearings are wiped out have a machinist check the clearances cause if its using spacer bearings or a large journal crank its likely not clearanced right, alot of these stroker cranks are made in china (eagle) and a crosseyed machinist could have made better cuts

if so your engine builder should fix it free, his fault for not checking clearances
and plastigauge is not a viable way for this

[stroker87]

Originally Posted by INSIDIOUS '86

if so your engine builder should fix it free, his fault for not checking clearances

once "most" of these engine builders get your money your warranty is over as soon as the engine leaves his hands, the 1st engine builder I used said my engine was "all checked" and ready to go! had it in stalled found out the oil pan was hitting a rod bolt after i got that worked out the engine never made the HP it should of tuning was a nightmare 3000 miles later I found out why after the engine died the distributor gear was chewed up since he never set the height, was suppose to be 10:1 and was 8.9:1 and the comp cams hydraulic roller lifters I paid for was a cheep $50 set and this was done be a big machine shop not a mom and pop place (witch i maybe should of used)

sorry for the rant just get up set when stuff like this happens!

[Reziel_1983]

The higher pitch noise seems to happen more often when the engine is warmed up, if that helps at all.

[3r!c84]

Sorry to hear about all this bro..
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[Reziel_1983]

Originally Posted by 3r!c84

Sorry to hear about all this bro..
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It'll all work out somehow. :P

Took out the engine today and miced(idk if that's how you would spell it) the crank and it is not a 10-10 crank as advertised... so it has been moving between the mains I guess causing the deep knock. The higher knock we think is the flywheel hitting the starter(I think that is what my dad told me, he's gonna put a new starter shim in it.) The red tube we're still not sure about, gonna put some fluid on the intake and see if it revs when we get the motor back in the truck.

[RFOX]

sorry to hear of your bad luck I hope everything works better for you when you put it back in!

[Reziel_1983]

Originally Posted by RFOX

sorry to hear of your bad luck I hope everything works better for you when you put it back in!

Thanks, me too. I guess stuff happens though, especially on your first time to do something. :P. Gotta learn somehow I guess.

[406 Q-ship]

Originally Posted by Reziel_1983

It'll all work out somehow. :P

Took out the engine today and miced(idk if that's how you would spell it) the crank and it is not a 10-10 crank as advertised... so it has been moving between the mains I guess causing the deep knock. The higher knock we think is the flywheel hitting the starter(I think that is what my dad told me, he's gonna put a new starter shim in it.) The red tube we're still not sure about, gonna put some fluid on the intake and see if it revs when we get the motor back in the truck.

Wait.......your saying the crank was turned more than .010 on the mains, do the spacer bearings match to the size of the crank journel (if the main is turned .020 under the crank the bearings should have .020 stamped in them). If the crank is moving foward eoungh to hit the starter nose you got much bigger problems, the thrust surfaces are beyond junk (this is the knocking). Sounds like to me that the engine builder may have thrown together junk and sold you a POS. I think your going to have to go through the engine and measure everything again!

BTW- there is no way a destroked 400 using a 350 crank, will have the rods hitting the oil pan. I use the oil pan off a 302 (1969) for my stock stroke 406 to have the windage tray and it does not hit.

[Reziel_1983]

Originally Posted by 406 Q-ship

Wait.......your saying the crank was turned more than .010 on the mains, do the spacer bearings match to the size of the crank journel (if the main is turned .020 under the crank the bearings should have .020 stamped in them). If the crank is moving foward eoungh to hit the starter nose you got much bigger problems, the thrust surfaces are beyond junk (this is the knocking). Sounds like to me that the engine builder may have thrown together junk and sold you a POS. I think your going to have to go through the engine and measure everything again!

BTW- there is no way a destroked 400 using a 350 crank, will have the rods hitting the oil pan. I use the oil pan off a 302 (1969) for my stock stroke 406 to have the windage tray and it does not hit.

The crank was turned more than .010 on the mains, yes. But it was SUPPOSED to be turned .010, from what the person who sold the crank to me said. I think it was accidentally turned .020 instead, but we'll just have to check whenever we get it miced(I thought we miced it but we didn't.) The bearings are stamped .010. The bearings have a few scratches but we didn't run it long so the crank is still in good shape.

[Reziel_1983]

And actually, we built the engine so it is our fault for not checking all the measurements... we just went by what the guy said that the crank was 10-10. It's not his fault really, it's the place he ordered it from's fault.

[Reziel_1983]

The crank is a 10-20 crank... not 10-10. Going to order new main bearings today.

[Reziel_1983]

Engine back in, noises are all gone, but that header tube is still glowing... sprayed fluid on the intake. Nothing...
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[68GMCCustom]

Not normal....has to be something. You sure the valves are opening and closing fully... on both the intake and the exhaust valves... for that cylinder?

[Reziel_1983]

Don't know how to tell if they are opening and closing all the way but I checked the rocker arms/pushrods and they all seem to work correctly. I even readjusted the valves... I guess it could be too.retarded timing but wouldn't that effect all cylinders rather than just one? Could the coating on the header just be thin?
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[Reziel_1983]

I wish I knew if it was doing this on the old engine... could tell if it's just a thin header tube then... it's a REALLY old header and isn't really a very quality one.

[stroker87]

Originally Posted by Reziel_1983

Don't know how to tell if they are opening and closing all the way but I checked the rocker arms/pushrods and they all seem to work correctly.

check a different pair of rockers or springs (intake/exhaust) rotate the engine and measure the highest height of each then check the pair that had the glowing header tube, I'm no pro but that should give you an idea if they are closing all the way

[Reziel_1983]

Also... it does NOT glow while idling if that is helpful information... only when doing the cam break in. Could it just be because the headers are getting very hot and that particular tube is very thin?

[92GMCDriver]

i cant say this from any personal experiences but i have heard of headers glowing during cam break in. not just one tube i usually heard of the whole thing glowing rather than one tube because of timing issues or carb issues etc..

[INSIDIOUS '86]

BTW- there is no way a destroked 400 using a 350 crank, will have the rods hitting the oil pan. I use the oil pan off a 302 (1969) for my stock stroke 406 to have the windage tray and it does not hit.[/QUOTE]

if i had mine i would show you lol

but it was a cheapo chrome pan, all i know is that stock origanals dont hit

maybe a valve is not sitting right on the seat, if the header is glowing its possible it may be a bent oor warped valve

[Reziel_1983]

Originally Posted by INSIDIOUS '86

BTW- there is no way a destroked 400 using a 350 crank, will have the rods hitting the oil pan. I use the oil pan off a 302 (1969) for my stock stroke 406 to have the windage tray and it does not hit.

if i had mine i would show you lol

but it was a cheapo chrome pan, all i know is that stock origanals dont hit

We had the oil pan off, nothing was hitting on anything, so I guess I got lucky . No more noises, it was all just that stupid crank not turned what it was supposed to be.

[68GMCCustom]

pull the valve cover, start the motor and verify full up and down open/close of both valves (watching @ valve tips) for that cylinder.... vs the other 3 on that side... with it running. Your not going to make a big oil mess unless you rev it up. Some people prefer to adjust their valves this way (engine running) vs the standard method.

[Evil Trailblazer SS]

This goes to show that spending an extra hour double and triple checking bearing clearances can save hours and hours of labor and heartache later. sorry you had to go through that, but at least you got it all worked out in the end! The header glow is another story. On your motor, it would have to be valvetrain related of something is wrong.
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