Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC 400/300 > Performance & Maintenance
Sign in using an external account
Register Forgot Password?


why did timing belt interval change to 90,000 in 1998

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 01-04-08, 10:59 PM   #1
WDoherty
Pole Position
Trader Score: (0)
 
Join Date: Apr 2006
Location: Texas
Posts: 245
Default why did timing belt interval change to 90,000 in 1998

I'm just curious why the recommended interval when from 60,000 for the sc400 to 90,000 in 1998, especially when the sc400 engine went interference in 96? The real question is i have a 92, the first belt was changed at 63,000 and i'm now at 128,000 and have the new timing belt kit, but considering all the labor, do i really need to change it now or wait for 90,000 miles to roll around, my father didn't change the timing belt on his 95 corolla till 120,000 miles and had no problems so i just wonder.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
WDoherty is offline   Reply With Quote
Old 01-04-08, 11:09 PM   #2
O. L. T.
Keeper of the light
Trader Score: (15)
 
O. L. T.'s Avatar
 
Join Date: Feb 2003
Location: 1997
Posts: 33,512
Default

You're asking a question about an engine part. This can go either in maintenance or the engine forum.

To answer your question, simple............. VVTI.
__________________
Mercedes C Class | 19" Staggered Zenetti's | HID's
OESpectrum Suspension | K&N filters | 2" drop

O. L. T. is offline   Reply With Quote
Old 01-05-08, 11:22 AM   #3
JBrady
Lexus Champion
Trader Score: (0)
 
Join Date: Feb 2001
Location: Texas
Posts: 3,077
Default

When I changed my 99 at 95k miles it looked very good. Toyota/Lexus is very conservative so the 90k interval on the interference engines is very SAFE. Your engine has the same basic parts and belt construction. It is also non-interference as you pointed out. I would go ahead and adopt the 90k interval.
__________________
99 LS400 Alpine Silver
1/4 stats: 14.22et 99.38mph
JBrady is offline   Reply With Quote
Old 01-05-08, 05:54 PM   #4
KC95SC400
Lexus Test Driver
Trader Score: (3)
 
KC95SC400's Avatar
 
Join Date: May 2007
Location: NC
Posts: 1,266
Default

Quote:
Originally Posted by O. L. T. View Post
You're asking a question about an engine part. This can go either in maintenance or the engine forum.

To answer your question, simple............. VVTI.
What does vvti have to do with anything? It doesn't affect belt wear.

The answer IS simple, it's marketing. Low maintence sells....

KC
__________________
Supercharged 96 Lexus SC400. Water / meth injection. Ross pistons. The "thick" factory rods.Gasket matched intake and heads. ARP head studs. Cometic head gaskets. ACL rod bearings. Flipped intake. Supra LSD. Built transmission. PI converter. Supra Tokico shocks with swift lowering springs. IMF headers. X-pipe. 2.5 inch exhaust. Adaptronic. Suprastick. Much more.

KC95SC400 is offline   Reply With Quote
Old 01-08-08, 02:07 PM   #5
WDoherty
Pole Position
Trader Score: (0)
 
Join Date: Apr 2006
Location: Texas
Posts: 245
Default

Quote:
Originally Posted by KC95SC400 View Post
What does vvti have to do with anything? It doesn't affect belt wear.

The answer IS simple, it's marketing. Low maintence sells....

KC
Thanks, i knew the 98 went to vvt-i and that more likely answers the question: marketing. I couldn't imagine how this change would affect belt wear either. So i pulled of the cam cover last night to look at the belt and it looks brand new, so i am going to extend the interval to 90,000 and sell the timing belt kit that i bought.
WDoherty is offline   Reply With Quote
Old 01-08-08, 03:51 PM   #6
link13
Lexus Champion
Trader Score: (0)
 
link13's Avatar
 
Join Date: Nov 2001
Location: Relaxed
Posts: 2,923
Default

The interval on my '94 GS300 was 90K. I had a former Lexus tech tell me the engine in the 1994s were non-interference and the belt could esily go 120K miles. When I had it changed at 120K miles, the mechanic told me the old belt looked fine, but he replaced it. I think you're fine going to 90K miles.
__________________
TLN #13
2014 IS250 F Sport, Ultra White/Rioja Red
1994 Lexus GS300
1985 Toyota Corolla GT-S
Los Angeles Kings hockey
link13 is offline   Reply With Quote
Old 01-08-08, 05:52 PM   #7
LexusFTW
Lexus Test Driver
Trader Score: (7)
 
Join Date: Sep 2005
Location: Tulsa
Posts: 1,454
Send a message via AIM to LexusFTW
Default

Quote:
Originally Posted by O. L. T. View Post
You're asking a question about an engine part. This can go either in maintenance or the engine forum.

To answer your question, simple............. VVTI.
That doesnt answer anything. Nice try though.
LexusFTW is offline   Reply With Quote
Old 01-08-08, 09:45 PM   #8
LEXpert
Pole Position
Trader Score: (0)
 
Join Date: Jun 2004
Location: Canada
Posts: 293
Default

I have a 92 SC, the T-belt was changed at 109 000 km (about 68 000 miles), and on the advice of a Lexus tech, he said adopt the 150 000 km interval (93 000 miles). I plan to change the belt at 259 000 km (161 000 miles).

I'm at 253 000 km (157 000 miles) with no ill effects as of yet.
LEXpert is offline   Reply With Quote
Old 01-08-08, 09:45 PM
 
 
 
 
Reply

Tags
1998, 2001, 60000, 90000, belt, change, es300, gs400, interval, intervals, lexus, maintenance, replacement, rx400h, sc400, timing

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

All times are GMT -7. The time now is 05:08 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info