Advertisement
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Home Who's Online Today's Posts HP Calculator CompD Gift Shop Mark Forums Read
Go Back   Competition Diesel.Com - Bringing The BEST Together > Tech Area- Dodge > Dodge Competition and Performance
Register Members List Timeslips EFI Live Library Invite Your Friends FAQ Calendar Mark Forums Read

Dodge Competition and Performance General Dodge Competition and Performance Discussion

Closed Thread
 
Thread Tools
Old 09-19-2019, 08:46 PM   #81
Scattered
 
Scattered's Avatar

Name: Scattered
Title: Green Behind the Ears
Status: Not Here
Join Date: Nov 2016
Location: Pittsburgh, PA
Member`s Gallery
Posts: 82
Checked compression and did a leakdown test on each cylinder. Checked it with the motor cold and hot.

Cold compression was 370psi on cylinder 1 and 6. 320psi on 2, 4, and 5, and 280psi on 3.
Checking it hot all the readings just went up about 10-15psi

Now when I did the leak down at 100psi cylinders 1 and 6 held 90psi.
But 2, 3, 4, and 5 only hold 45-55psi. There’s a pretty loud hiss coming out the exhaust. No hiss out the intake, no bubbles in the radiator, and nothing terrible coming out the crankcase breathers either. Cylinder 1 and 6 there was no hiss.

I searched a bit but didn’t find an exact spec for compression. I didn’t think that was too bad, the motor just not has 130k on it and it’s only been abused for about 2k miles.
Could it be exhaust valves not sealing contributing to my issue?

I still need to try another set of governor springs it it too
__________________
2001 QCSB- castrated puller, back to “stock”.
2002 QCLB- Tow pig
2001 QCLB- WS/2.5 P24v
 
Old 09-20-2019, 05:32 AM   #82
MufflerBearing
 
MufflerBearing's Avatar

Name: MufflerBearing
Title: Too Much Time
Status: Not Here
Join Date: Oct 2008
Location: Boyertown, PA
Member`s Gallery
Posts: 1,188
Quote:
Originally Posted by Scattered View Post
Checked compression and did a leakdown test on each cylinder. Checked it with the motor cold and hot.



Cold compression was 370psi on cylinder 1 and 6. 320psi on 2, 4, and 5, and 280psi on 3.

Checking it hot all the readings just went up about 10-15psi



Now when I did the leak down at 100psi cylinders 1 and 6 held 90psi.

But 2, 3, 4, and 5 only hold 45-55psi. There’s a pretty loud hiss coming out the exhaust. No hiss out the intake, no bubbles in the radiator, and nothing terrible coming out the crankcase breathers either. Cylinder 1 and 6 there was no hiss.



I searched a bit but didn’t find an exact spec for compression. I didn’t think that was too bad, the motor just not has 130k on it and it’s only been abused for about 2k miles.

Could it be exhaust valves not sealing contributing to my issue?



I still need to try another set of governor springs it it too
What for camshaft are you running?

Sent from my SAMSUNG-SM-G891A using Tapatalk
__________________
17' Mega 3500 W/Aisin, 2nd gen swap with billet S468
87' 4runner LS, NV4500, 1 Tons.
 
Old 09-20-2019, 05:54 AM   #83
Scattered
 
Scattered's Avatar

Name: Scattered
Title: Green Behind the Ears
Status: Not Here
Join Date: Nov 2016
Location: Pittsburgh, PA
Member`s Gallery
Posts: 82
188/220 Hamilton
__________________
2001 QCSB- castrated puller, back to “stock”.
2002 QCLB- Tow pig
2001 QCLB- WS/2.5 P24v
 
Old 09-20-2019, 06:31 AM   #84
zachu812
 
zachu812's Avatar

Name: zachu812
Title: Too Much Time
Status: Not Here
Join Date: Apr 2016
Member`s Gallery
Posts: 419
Forgive me for not reading through the whole thing, but has the head ever been off and checked? I was chasing my tail trying to figure out why my truck was down on power all last summer. Still ran ok but it wasn't how it should've been, boost was only down about 10psi from normal and had no leaks elsewhere. No matter what I did it wouldn't clean up and I had more than enough air. Compression test showed 1 & 6 about 50 psi higher than the others and they all had more leak down than I would've liked. Ended up pulling the head and found about a dozen cracked valve seats, new head and it was back to normal. Might be worth a check at this point.
__________________
1995 RCLB 4x4: H-pump, 5x.012s, HX35
2001 RCLB 4x4: H-pump, 6x.013s, S472/S488
EdzGarage, Matt's Diesel Supply, HTS Transmissions
 
Old 09-20-2019, 08:40 AM   #85
Scattered
 
Scattered's Avatar

Name: Scattered
Title: Green Behind the Ears
Status: Not Here
Join Date: Nov 2016
Location: Pittsburgh, PA
Member`s Gallery
Posts: 82
Quote:
Originally Posted by zachu812 View Post
Forgive me for not reading through the whole thing, but has the head ever been off and checked? I was chasing my tail trying to figure out why my truck was down on power all last summer. Still ran ok but it wasn't how it should've been, boost was only down about 10psi from normal and had no leaks elsewhere. No matter what I did it wouldn't clean up and I had more than enough air. Compression test showed 1 & 6 about 50 psi higher than the others and they all had more leak down than I would've liked. Ended up pulling the head and found about a dozen cracked valve seats, new head and it was back to normal. Might be worth a check at this point.
Nope the head has never been off this engine since it was new. Sounds like your leak down results were the same as mine. Since there’s a pretty loud hiss coming out the exhaust I’m betting it does have bad valve seats. It’ll be coming off this winter for sure.
__________________
2001 QCSB- castrated puller, back to “stock”.
2002 QCLB- Tow pig
2001 QCLB- WS/2.5 P24v
 
Closed Thread

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:19 AM.

 


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2024, CompetitionDiesel.com
all information found on this site is property of www.competitiondiesel.com