Exhaust coming out the valves - Competition Diesel.Com

timesublime · 08-06-2016, 06:36 PM

I just tried to start my truck after getting the head back from the machine shop.

It started after a while but a loud popping noise was coming out the engine. I traced it to #6 cylinder. Raw partially burnt exhaust is coming out the valves.

I checked and the valves move up and down as normal.

I am completely stumped on this one.

stubz616 · 08-06-2016, 06:38 PM

Where exactly is the exhaust coming out of the valves and what did the machine shop do to the head?

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timesublime · 08-06-2016, 06:41 PM

I can't pinpoint it exactly there is so much smoke. The shop ported, o-ringed and installed oversize valves. I looked at the headgasket at the back and no smoke comes out at the interface.

jasonc · 08-06-2016, 06:45 PM

What's the valve lash on that cyl.

timesublime · 08-06-2016, 06:46 PM

.01 .02

K204DR · 08-06-2016, 07:23 PM

somebody put the valves in backwards?

timesublime · 08-06-2016, 09:11 PM

I have been thinking that the valve seat has dropped out. It is the only thing i can fathom.

jimbo486 · 08-06-2016, 09:42 PM

Is it coming out of the exhaust runner or out of the valve guides? Or back into the intake?

timesublime · 08-06-2016, 09:50 PM

It's so pronounced that I cannot see the source other that #6. I really have a feeling that the valve seat fell out.

timesublime · 08-06-2016, 09:52 PM

They pressed in new seats to match the oversize valves.

jimbo486 · 08-06-2016, 09:52 PM

Yeah, sorry. I just caught that in your earlier post and deleted that response.

Seems like you'd know if the seat fell out unless the valve doesn't open enough to allow it to fall out completely.

timesublime · 08-06-2016, 09:57 PM

It's more likely a piece of the seal. I'm grasping at straws here but the only way for exhaust to get in is through the valves, or a hole in the casting, right?

timesublime · 08-06-2016, 09:59 PM

^seat

jimbo486 · 08-06-2016, 10:03 PM

Any chance you can get a video of this? I may not be able to offer much help but usually hearing and seeing it might help others.

cumminsman315 · 08-08-2016, 09:49 AM

If the seat fell out then that particular valve/valves will not have the same stem protrusion as the rest, you should be able to measure or even eye ball it with the valve cover off

timesublime · 08-08-2016, 11:13 AM

The valves are sitting at the same height and the valve lash is still the same. I pulled the turbos off and looked in the exhaust port. All the other valves are shiny and clean. #6 is slicked with oil and there are little bits of metal all over the port and the turbine of the turbo and the hot pipe. Something is f'ed in there.

cumminstroked · 08-08-2016, 03:39 PM

If you can get your hands on a decent scope you could pull your injector and take a look down in the hole. Are the metal shavings magnetic?

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9724VF350 · 08-08-2016, 03:42 PM

Quote:

Originally Posted by timesublime

I have been thinking that the valve seat has dropped out. It is the only thing i can fathom.

You'll have lots of bad noises when a seat falls out.

timesublime · 08-08-2016, 03:45 PM

It was lots of bad noises.

I ordered one of those 7mm borescopes that attach to your smartphone for $15. Going to snake it down there and look. Will check if the shards are magnetic, this would indicate the head instead of the piston?

cumminstroked · 08-08-2016, 05:02 PM

Yeah any steel or cast will be magnetic. Pistons are aluminum so it won't pick them up.

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08-06-2016, 06:36 PM	#1
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	Exhaust coming out the valves I just tried to start my truck after getting the head back from the machine shop. It started after a while but a loud popping noise was coming out the engine. I traced it to #6 cylinder. Raw partially burnt exhaust is coming out the valves. I checked and the valves move up and down as normal. I am completely stumped on this one. __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 06:38 PM	#2
stubz616 Name: stubz616 Title: Too Much Time Status: Not Here Join Date: Oct 2008 Location: Brewster, MA Member`s Gallery Posts: 1,327	Where exactly is the exhaust coming out of the valves and what did the machine shop do to the head? Sent from my iPhone using Tapatalk __________________ 95 RCLB Farrell Diesel Stage 5 13mm pump,Hamilton Springs,Retainers,Pushrods,Fluidampr,Steed Speed,S467.7/soon to be S488 atmo,Full Billet Trans,DPC 4 disk TC,BD Pressure Loc,Haley Speed 5x.022s,Diesel Pros Custom Cam,O-Ringed,.010 over HG,A1000,Hellman sump,625 Studs, 30*

08-06-2016, 06:41 PM	#3
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	I can't pinpoint it exactly there is so much smoke. The shop ported, o-ringed and installed oversize valves. I looked at the headgasket at the back and no smoke comes out at the interface. __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 06:46 PM	#5
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	.01 .02 __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 09:11 PM	#7
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	I have been thinking that the valve seat has dropped out. It is the only thing i can fathom. __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 06:45 PM	#4
jasonc Name: jasonc Title: Too Much Time Status: Not Here Join Date: Nov 2009 Member`s Gallery Posts: 4,412	What's the valve lash on that cyl.

08-06-2016, 07:23 PM	#6
K204DR Name: K204DR Title: I'm the Driver Status: Not Here Join Date: Jun 2008 Location: TN Member`s Gallery Posts: 971	somebody put the valves in backwards? __________________ 88 Chevy crewcab 6bt nv4500 valair clutch

08-06-2016, 09:42 PM	#8
jimbo486 Name: jimbo486 Title: Too Much Time Status: Not Here Join Date: Jan 2010 Location: Orange County, CA Member`s Gallery Posts: 1,617	Is it coming out of the exhaust runner or out of the valve guides? Or back into the intake? __________________ 1990 Dodge D350 Giles' 12mm VE - Airdog II 165 - 370s @ 75lpm - BW S362fmw/68/12 - Hamilton 182/214 - '01 NV5600

08-06-2016, 09:50 PM	#9
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	It's so pronounced that I cannot see the source other that #6. I really have a feeling that the valve seat fell out. __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 09:52 PM	#10
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	They pressed in new seats to match the oversize valves. __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 09:57 PM	#12
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	It's more likely a piece of the seal. I'm grasping at straws here but the only way for exhaust to get in is through the valves, or a hole in the casting, right? __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 09:59 PM	#13
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	^seat __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-06-2016, 10:03 PM	#14
jimbo486 Name: jimbo486 Title: Too Much Time Status: Not Here Join Date: Jan 2010 Location: Orange County, CA Member`s Gallery Posts: 1,617	Any chance you can get a video of this? I may not be able to offer much help but usually hearing and seeing it might help others. __________________ 1990 Dodge D350 Giles' 12mm VE - Airdog II 165 - 370s @ 75lpm - BW S362fmw/68/12 - Hamilton 182/214 - '01 NV5600

08-08-2016, 09:49 AM	#15
cumminsman315 Name: cumminsman315 Title: Too Much Time Status: Not Here Join Date: May 2009 Location: Missouri Member`s Gallery Posts: 987	If the seat fell out then that particular valve/valves will not have the same stem protrusion as the rest, you should be able to measure or even eye ball it with the valve cover off __________________ 01 24v

08-08-2016, 03:39 PM	#17
cumminstroked Name: cumminstroked Title: Too Much Time Status: Not Here Join Date: Dec 2009 Location: Otwell IN Member`s Gallery Posts: 771	If you can get your hands on a decent scope you could pull your injector and take a look down in the hole. Are the metal shavings magnetic? Sent from my iPhone using Tapatalk __________________ James F350 lariat 4x4 2008 6.4l F250SD 4x4 5.9L 12V 6speed with a few aftermarket parts.

08-08-2016, 03:45 PM	#19
timesublime Name: timesublime Title: Compression Ignition Status: Not Here Join Date: Jun 2013 Location: Colorado Member`s Gallery Posts: 73	It was lots of bad noises. I ordered one of those 7mm borescopes that attach to your smartphone for $15. Going to snake it down there and look. Will check if the shards are magnetic, this would indicate the head instead of the piston? __________________ 1995 4x4 rclb 47rh fully built s300g s472 5x14 024

08-08-2016, 05:02 PM	#20
cumminstroked Name: cumminstroked Title: Too Much Time Status: Not Here Join Date: Dec 2009 Location: Otwell IN Member`s Gallery Posts: 771	Yeah any steel or cast will be magnetic. Pistons are aluminum so it won't pick them up. Sent from my iPhone using Tapatalk __________________ James F350 lariat 4x4 2008 6.4l F250SD 4x4 5.9L 12V 6speed with a few aftermarket parts.