Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 04-05-2011, 06:30 AM   #1
free_couch
Stock
 
Join Date: Apr 2011
Location: Sacramento
Posts: 1
free_couch is on a distinguished road
Default Bad valve guides or piston rings?

I have a 86.5 supra with a 7mgte and I pulled the head yesterday when a leak down test forced coolant out of the radiator on every cylinder. I found the head to be poorly surfaced, looks like it was done with a hand sander or grinder, and it is also warped. This explains the coolant problem but I also found that the valves in cylinders 3, 5 and 6 have heavy oil/carbon deposits. I also noticed that the spark plugs from these cylinders were covered in oil as well. I know my engine had been burning a little oil on startup, it used to burn a lot of oil on startup but i replaced the valve stem seals last summer. I'm hoping that the oily valves are caused by bad valve guides but someone on another forum thinks it looks so bad that it must be the piston rings. Any thoughts? I had good cylinder compression: cylinders 1-6: 170,170,182,175,180,180. (note the higher compression on the cylinders that have heavy oil/carbon deposits)
Here are some pictures:
http://www.flickr.com/photos/61419666@N06/
free_couch is offline   Reply With Quote
Old 04-06-2011, 03:48 AM   #2
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

Quote:
Originally Posted by free_couch View Post
the valves in cylinders 3, 5 and 6 have heavy oil/carbon deposits. I also noticed that the spark plugs from these cylinders were covered in oil as well. I know my engine had been burning a little oil on startup, good cylinder compression: cylinders 1-6: 170,170,182,175,180,180. (note the higher compression on the cylinders that have heavy oil/carbon deposits)
tsrm says you can expect a varation of up to 14psi between cylinders. (please correct me if im wrong)
valve guides usually present themselves with smoke on startup / deceleration
Hows your #3 valve cover gasket.
Its hard for me to give you a definite answer, I really never fiddled with my valves first hand.
with your car at idle can you see bubbles oozing out around your spark plugs?
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :

Green7mgte is offline   Reply With Quote
Reply

Tags
7mgte, burning oil, head gasket, piston rings, valve guides


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
piston rings which ones to get? Clorox9 MKIII Supra 0 06-14-2009 04:35 PM
Piston rings Clorox9 MKIII Supra 2 06-07-2009 08:10 PM
Bhg vs worn rings vs valve guides Kuban MKIII Supra 22 04-23-2007 02:18 AM
Valve stem seals? Kuban MKIII Supra 9 03-27-2007 02:32 AM
1jz & 2jz Piston Rings joolhamdi MKIII Supra 4 04-14-2006 02:44 AM


All times are GMT. The time now is 02:46 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87