Burning Oil? - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Workshop

C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum.

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 18th December 2003
DrSquirley's Avatar
DrSquirley DrSquirley is offline
Saab Crazy
 
Join Date: Dec 2003                                                
Location: Gorham,Maine, US/potsdam,ny
My Saabs: '89 900S 3dr | '90 900S 4dr
Posts: 528
Default Burning Oil?

my n/a900S has small bit of smoke coming out of oil fill/check tube and the levels are very low. what other symptoms would there be and what could be causing this. the tappets are very worn an noisy could they be the culpret?

edit: been thinking, could the oil pickup screen be clogged? would that produce those effects? im pretty it would cause the noise of the tappets...
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 18th December 2003
gerryp's Avatar
gerryp gerryp is offline
Saab Crazy
 
Join Date: Dec 2003                                                
Location: '88a c900t16s Harlow, UK
Posts: 506
Default

Cheap answer
The noisy tappets could well be due to the low oil level as could smoke/vapour from the filler tube (oil gets very hot if the level's too low).

Expensive answer
Smoke may also be due to piston blowbye. This indicates wear to the engine bores. If this gets too bad it means a major engine rebuild.

I suggest you fill the engine up to max oil level and let it tick over. See if the noisy tappets go away.

I would also look into the cause of the low oil level before I went on another journey - its a lot cheaper than getting the car recovered. :-?
Reply With Quote Quick reply to this message
  #3  
Old 18th December 2003
Matthew's Avatar
Matthew Matthew is offline
Saab Mad
 
Join Date: Dec 2001                                                
Location: Gloucestershire, UK
My Saabs: 900 S Aero Turbo, 9-5 Aero
Posts: 14,069
Default

As an aside, knackered tappets are fairly straightforward to replace. However, it's unusual for all sixteen tappets to wear out at the same time - more often it's one or two.
Reply With Quote Quick reply to this message
  #4  
Old 18th December 2003
DrSquirley's Avatar
DrSquirley DrSquirley is offline
Saab Crazy
 
Join Date: Dec 2003                                                
Location: Gorham,Maine, US/potsdam,ny
My Saabs: '89 900S 3dr | '90 900S 4dr
Posts: 528
Default

Quote:
Originally Posted by gerryp

Expensive answer
Smoke may also be due to piston blowbye. This indicates wear to the engine bores. If this gets too bad it means a major engine rebuild.
And how would i prevent this, keep the oil up? is there anything else i can check in regard to the engine bore wear? is it caused by heat? poor oil? over use/high rpm?
Reply With Quote Quick reply to this message
  #5  
Old 18th December 2003
DrSquirley's Avatar
DrSquirley DrSquirley is offline
Saab Crazy
 
Join Date: Dec 2003                                                
Location: Gorham,Maine, US/potsdam,ny
My Saabs: '89 900S 3dr | '90 900S 4dr
Posts: 528
Default

clearly im the only one posting here, but at least im solving problems.

ok, the news is that it wasnt getting dangerously low because it was burning it all, theres a confirmed leak somewhere, i can see it on the floor

next question is, where are the spots to look for this leak?
Reply With Quote Quick reply to this message
  #6  
Old 18th December 2003
Saabrina Saabrina is offline
Junior Member
 
Join Date: Aug 2003                                                
Location: New Jersey
Posts: 14
Default

You can check for piston-blowby by doing a compression test. record all the pressures of the cylenders, know inject a small amount or oil into the cylender using a syrige. If know try another compression test. The oil will temporarly seal the rings if you are expexencing blow-by. this will create a higher pressure in the cylender than the first test. Make sure you test the compreccion with no s-plugs, and WOT.
Reply With Quote Quick reply to this message
  #7  
Old 19th December 2003
garry's Avatar
garry garry is offline
Saab Lunatic
 
Join Date: Apr 2003                                                
Location: Scotland - in, A Red 92 T16S De'cat 3"JT system, Hot APC, 9K FMIC, Whaletail, Carly Aero's, Spax'ed.
Posts: 1,603
Default

Quote:
Originally Posted by DrSquirley
clearly im the only one posting here, but at least im solving problems.

ok, the news is that it wasnt getting dangerously low because it was burning it all, theres a confirmed leak somewhere, i can see it on the floor

next question is, where are the spots to look for this leak?
First place I would look is the oild drain plug.... very often the washer is not replaced after a change or it is simply too slack.

then, head gasket.... You would typically think that if a head gasket had blown it would be visible from the performance and all the fluids geting mixed up.... but, a gasket can crack at on the outside edge allowing oil to seep down the block only slightly affecting oil circulation/pressure (tappets etc).

Is the rocker cover tight enough?

Hope you locate it.... maybe a steam clean will help.
Reply With Quote Quick reply to this message
  #8  
Old 20th December 2003
DrSquirley's Avatar
DrSquirley DrSquirley is offline
Saab Crazy
 
Join Date: Dec 2003                                                
Location: Gorham,Maine, US/potsdam,ny
My Saabs: '89 900S 3dr | '90 900S 4dr
Posts: 528
Default

Quote:
Originally Posted by garry

First place I would look is the oild drain plug.... very often the washer is not replaced after a change or it is simply too slack.

then, head gasket.... You would typically think that if a head gasket had blown it would be visible from the performance and all the fluids geting mixed up.... but, a gasket can crack at on the outside edge allowing oil to seep down the block only slightly affecting oil circulation/pressure (tappets etc).


its beginging to seem like the head gasket but my fluids are still clean, so perhaps the break is on the outside edge. also, its been running idle a little high lately, not too much jsut more around 1000 rpm instead of 8500-9000 would this point to head gasket or just in need of some throttle body and aic cleaning? (vacuum sys checked out)

perhaps piston ring is gone though, ill do a compression test monday, i probably shouldnt be driving her around right?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 -4. The time now is 09:45 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.