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Misfires on 4,5,8. Iím going to document what I try.

 
  #46  
Old 06-07-2019, 02:46 PM
wbubble
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Thanks for the info!

Last night I got the timing cover and both valve covers off, and started breaking the head bolts loose.

Looks like Ike this is going to be about an hour a night project.


 
  #47  
Old 06-09-2019, 06:38 PM
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The Head is Out!

Woohoo the head is out! My engine hoist isn’t long enough so I manhandled the head and exhaust manifold out in one piece. I crawled in the engine bay and stood on the radiator supports. My oh my.

The lower rear 3 head bolts caused me just a little trouble, as expected, but I did NOT have to lower the engine or remove the heater box to get it out! This is a huge relief.

I zip tied the heck out of the timing chain and cam gear as to ensure no movement there, so as long as I can reinstall the head with the cam in the same position, timing should be good.

I’m including a photo of the valves from cylinders 4 and 5. Cylinder 4 is crusted up just like the spark plug was on that one originally.

Does anyone one know how to verify that the rings are good on that cylinder before I reassemble? I suppose if I remove the valves and they’re damaged, I’ll know the low compression was caused by that...

I’ve officially reached the end of my experience with this stuff. From here on out I’m a first timer.


I had pretty easy access to the head bolts with the fender liner out.

Zip ties for insurance.

Looks like it came out of an aircraft. Large.

That feels good.

5 on left, 4 on right. The intake valve on 4 is particularly ugly.
 

Last edited by wbubble; 06-10-2019 at 12:00 AM. Reason: typo
  #48  
Old 06-10-2019, 04:39 AM
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Nice work!

i know of no way to verify piston rings at this point.
I say that with authority because I had my head(s) removed and wondered the same thing for much much thought time.

I reassembled mine on faith.

Yours... is quite a mystery.
 
  #49  
Old 06-10-2019, 07:38 AM
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What does the intake port on #4 look like?
 
  #50  
Old 06-10-2019, 08:47 AM
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Originally Posted by Krewat View Post
What does the intake port on #4 look like?

 
  #51  
Old 06-10-2019, 08:53 AM
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I wonder if the valve guide is worn beyond belief? Do the other valves look that crusty inside?
 
  #52  
Old 06-10-2019, 09:01 AM
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Blown head gasket?

On further inspection, this kind of looks like a head gasket failure between 4 and 5. Could that be responsible for the valve build up?


Top of the old gasket

Discoloration between 4 and 5 on the head.
 
  #53  
Old 06-10-2019, 09:02 AM
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Originally Posted by Im50fast View Post
Nice work!

i know of no way to verify piston rings at this point.
I say that with authority because I had my head(s) removed and wondered the same thing for much much thought time.

I reassembled mine on faith.

Yours... is quite a mystery.
I filled up the cylinder with water and let it sit overnight. It was still full this morning.

 
  #54  
Old 06-10-2019, 09:07 AM
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Originally Posted by Krewat View Post
I wonder if the valve guide is worn beyond belief? Do the other valves look that crusty inside?
All others look good.
 
  #55  
Old 06-10-2019, 09:55 AM
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I don't think that head gasket breached. Maybe the gasket came apart as you disassembled it.

As for water to test for leaks, water has a high surface tension and it might not flow into a narrow enough area to really test if the cylinder isn't sealing.

I'd check the valve guide clearance on #4's intake valve.
 
  #56  
Old 06-10-2019, 02:37 PM
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Get a new head and be done with it.

It will cost $400 to $500 to refurbish this head. Done right. Could be as simple as a valve seal but probably a bad guide too in addition to a bad valve. And your left with a refurbished head that needs a thicker HG.

My advise is get a new one for a few hundred dollars more.

Also look closely at discoloration between #1 and #2 cylinders on block. Something looks odd with redish brown color on those two.
 
  #57  
Old 06-10-2019, 02:51 PM
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Originally Posted by rock2610d View Post
Also look closely at discoloration between #1 and #2 cylinders on block. Something looks odd with redish brown color on those two.
Thats light reflecting off something on my garage wall. Iím going to take a closer look at the block when I remove the head gasket.

Thanks!
 
  #58  
Old 06-11-2019, 05:17 AM
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Originally Posted by rock2610d View Post
Get a new head and be done with it.

It will cost $400 to $500 to refurbish this head. Done right. Could be as simple as a valve seal but probably a bad guide too in addition to a bad valve. And your left with a refurbished head that needs a thicker HG.

My advise is get a new one for a few hundred dollars more.

Also look closely at discoloration between #1 and #2 cylinders on block. Something looks odd with redish brown color on those two.
I got mine rebuilt for $325-ish. Per head. A month apart so it didnít feel like $650.
 
  #59  
Old 06-11-2019, 06:25 PM
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Partially disassembling the head.


Head is cleaning up and my straight edge indicates that itís very straight!

Thatís a gross valve. Iíll be testing all 10 but Iíve already ordered intake and exhaust for #4.
 
  #60  
Old 06-11-2019, 09:17 PM
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Bro, you are taking it to a machine shop right?
Please say yes.
Those guys are wizards and youíd be foolish to avoid them just to save a few duckets.
 

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