Valve Stem Seals

guybloom · 21-08-2009, 07:13 PM

I own a Mazda Astina 1997 model 4 cyl 1.8lt

Can anyone tell me for sure if the Valve Stem Seals can be changed without taking the head out by a qualified mechanic

maztech · 21-08-2009, 07:27 PM

Yes you can change Valve stem seals without taking head off any qualified person should know how to do this job.

guybloom · 27-08-2009, 06:28 PM

I am sure that my seals are worn as the car is smoking in the morning only however when the car is hot it does not smoke unless I rev it to at least 5000 rpm or more does this mean my piston rings are worn ? or is it the valve seals as well.

project.r.racing · 27-08-2009, 06:31 PM

both are worn...

guybloom · 27-08-2009, 06:32 PM

Does anyone know what is the labor time it takes to change valve seals approximately

guybloom · 27-08-2009, 06:35 PM

My compression is fine is there a reason to worry about the smoking in high revs ?

Also I lose about 1 liter for 1000 km which is influencing the most the rings ? or the valve seals ?

project.r.racing · 27-08-2009, 06:37 PM

both...

sounds like you need a full rebuild. oil rings and valve stem seals and both gone...

guybloom · 27-08-2009, 06:46 PM

is this making my car lose power ?

Mad Mat · 27-08-2009, 06:54 PM

yep or more of a 2 stroke

project.r.racing · 27-08-2009, 07:03 PM

Quote:

Originally Posted by guybloom

is this making my car lose power ?

yes it is.

maztech · 27-08-2009, 07:17 PM

What colour is the smoke from ya car in the mornings?
You need to do a compression test wet and dry to determine condition of the motor
What grade oil is being used in the motor as to thin oil in old motor will burn it and blow smoke

project.r.racing · 27-08-2009, 07:41 PM

by the time my engine was retired, i had 40W-70 in it and it still blew blue smoke for 90 seconds after start up and above 5000rpm.

now i'm running 15W-40 and no blue smoke.

maztech · 27-08-2009, 07:49 PM

S--T that is thick oil your motor had seen better days sounds like you should have put gearoil in it lol good smoke machine though

project.r.racing · 27-08-2009, 07:56 PM

yeah gear oil was the next step...

still sitting on the workshop floor. might rebuild it with supertech 85.5mm bored pistons. nothing like a 11:1 comp ratio and 110cc increase to make it a little screamer.

maztech · 27-08-2009, 08:03 PM

Nice

Clean_Cookie · 27-08-2009, 08:13 PM

full rebuild costs how much (say I take out engine and replace) by a pro? anyon know GOOD brisbane people? thanks!

project.r.racing · 27-08-2009, 08:20 PM

depends on what is required doing. if the engine has been run on low oil levels, then some machining of the crank may be required. but is you are pulling the engine out yourself, maybe around $2000. send maztech a pm, maybe he can help you out.

if you have the mech know how to fit and remove an engine, it be cheaper to just replace the engine with a low km one. low km BA engines go for $750-$1000.

maztech · 27-08-2009, 08:55 PM

Motor swap easy / cheaper way out .... yeh i would do it no problems i do a bit of weekend work

chrisw · 27-08-2009, 10:23 PM

i remember my valve stem seals were goneski's in my old KF 1.6 laser... god damn... would fill the street with blue/white smoke on startup, then be perfectly fine after 2-4 minutes.

my SOHC BP is a "little" bit worn, it doesnt smoke much at all, except of course for 5000+ rpm throttle blips.

guybloom · 28-08-2009, 01:15 AM

Quote:

Originally Posted by maztech

What colour is the smoke from ya car in the mornings?
You need to do a compression test wet and dry to determine condition of the motor
What grade oil is being used in the motor as to thin oil in old motor will burn it and blow smoke

I have done a compression test and all my cylinders seem fine. I have done wet and dry. I think it was 190 for dry and 210 for wet all even in all cylinders.

My car is definitely smoking blue smoke in the morning and seems like the same colour at 5000+ rpm. Is it then possible that it is the stem seals that make the car smoke at high revs.

When I used magnatex it definitely smoked less in the morning. I am currently using 30-70 and it smokes more than magnatex in the morning. If my memory is correct it smokes the same at high revs. The only reason I stopped using magnatex is because I lost too much oil. I would have to refill 2 times per week. Now I refill every 6 weeks or so.

21-08-2009, 07:13 PM	#1
guybloom Junior Member Join Date: Mar 2009 Location: Sydney Car: Mazda Astina Hatch BA 1997 Posts: 67	Valve Stem Seals I own a Mazda Astina 1997 model 4 cyl 1.8lt Can anyone tell me for sure if the Valve Stem Seals can be changed without taking the head out by a qualified mechanic

27-08-2009, 06:54 PM	#9
Mad Mat HONEYWELL REPRESENT Join Date: Aug 2005 Location: Salisbury - Inner City Car: 1997 BA Hardtop - Had a 2003 BJii J48 Sport20, and 2x bg SOHC astina hatches Posts: 5,011 View Photos By: Mad Mat	yep or more of a 2 stroke __________________ PROJECT "Catalina" 1994 323 BG Hatch 2005-2007 Crashed into truck 1991 323 BG Hatch 2007-2008/9 SOLD 2003 BJ SP20 J48 Hatch 2008-2011 Regretfully SOLD 1997 BA I4 Sedan 2012-CURRENT 1985 BF 323 Hatch 2014-2015SOLD 1989 MX5 2015-2015

27-08-2009, 08:13 PM	#16
Clean_Cookie obsessed-incomplete-broke Join Date: Oct 2008 Location: Brisbane Car: BA Hardtop/Hatch Posts: 5,441	full rebuild costs how much (say I take out engine and replace) by a pro? anyon know GOOD brisbane people? thanks! __________________ Worklog

27-08-2009, 08:20 PM	#17
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	depends on what is required doing. if the engine has been run on low oil levels, then some machining of the crank may be required. but is you are pulling the engine out yourself, maybe around $2000. send maztech a pm, maybe he can help you out. if you have the mech know how to fit and remove an engine, it be cheaper to just replace the engine with a low km one. low km BA engines go for $750-$1000. Last edited by project.r.racing; 27-08-2009 at 08:36 PM.

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21-08-2009, 07:27 PM	#2
maztech Senior Member Join Date: Aug 2009 Location: QLD Car: ...... Posts: 952	Yes you can change Valve stem seals without taking head off any qualified person should know how to do this job.

27-08-2009, 06:28 PM	#3
guybloom Junior Member Join Date: Mar 2009 Location: Sydney Car: Mazda Astina Hatch BA 1997 Posts: 67	I am sure that my seals are worn as the car is smoking in the morning only however when the car is hot it does not smoke unless I rev it to at least 5000 rpm or more does this mean my piston rings are worn ? or is it the valve seals as well.

27-08-2009, 06:31 PM	#4
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	both are worn...

27-08-2009, 06:32 PM	#5
guybloom Junior Member Join Date: Mar 2009 Location: Sydney Car: Mazda Astina Hatch BA 1997 Posts: 67	Does anyone know what is the labor time it takes to change valve seals approximately

27-08-2009, 06:35 PM	#6
guybloom Junior Member Join Date: Mar 2009 Location: Sydney Car: Mazda Astina Hatch BA 1997 Posts: 67	My compression is fine is there a reason to worry about the smoking in high revs ? Also I lose about 1 liter for 1000 km which is influencing the most the rings ? or the valve seals ?

27-08-2009, 06:37 PM	#7
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	both... sounds like you need a full rebuild. oil rings and valve stem seals and both gone...

27-08-2009, 06:46 PM	#8
guybloom Junior Member Join Date: Mar 2009 Location: Sydney Car: Mazda Astina Hatch BA 1997 Posts: 67	is this making my car lose power ?

27-08-2009, 07:17 PM	#11
maztech Senior Member Join Date: Aug 2009 Location: QLD Car: ...... Posts: 952	What colour is the smoke from ya car in the mornings? You need to do a compression test wet and dry to determine condition of the motor What grade oil is being used in the motor as to thin oil in old motor will burn it and blow smoke

27-08-2009, 07:41 PM	#12
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	by the time my engine was retired, i had 40W-70 in it and it still blew blue smoke for 90 seconds after start up and above 5000rpm. now i'm running 15W-40 and no blue smoke.

27-08-2009, 07:49 PM	#13
maztech Senior Member Join Date: Aug 2009 Location: QLD Car: ...... Posts: 952	S--T that is thick oil your motor had seen better days sounds like you should have put gearoil in it lol good smoke machine though

27-08-2009, 07:56 PM	#14
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	yeah gear oil was the next step... still sitting on the workshop floor. might rebuild it with supertech 85.5mm bored pistons. nothing like a 11:1 comp ratio and 110cc increase to make it a little screamer.

27-08-2009, 08:03 PM	#15
maztech Senior Member Join Date: Aug 2009 Location: QLD Car: ...... Posts: 952	Nice

27-08-2009, 08:55 PM	#18
maztech Senior Member Join Date: Aug 2009 Location: QLD Car: ...... Posts: 952	Motor swap easy / cheaper way out .... yeh i would do it no problems i do a bit of weekend work

27-08-2009, 10:23 PM	#19
chrisw 2-Wheeled Weirdo Join Date: Jul 2008 Location: sydney. Car: '09 GT650r Posts: 569 View Photos By: chrisw	i remember my valve stem seals were goneski's in my old KF 1.6 laser... god damn... would fill the street with blue/white smoke on startup, then be perfectly fine after 2-4 minutes. my SOHC BP is a "little" bit worn, it doesnt smoke much at all, except of course for 5000+ rpm throttle blips.