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Mitsuboshi Timing Belts #5192616 08/21/19 04:02 AM
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artbuc Offline OP
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I have installed several over the years (Aisin kits) and never had a problem. On another auto forum, someone just posted to avoid Mitsuboshi timing belts because he had two that broke on him. I know Mitsuboshi makes some of their TB’s in Thailand. Is it possible the Thai belts are inferior to the ones made in Japan? I am not a mechanic but have read extensively about timing belt quality and failure modes over the last 20 years or so. I can not recall a single case where a relatively new timing belt failed on its own. Failures are always a result of a faulty tensioner, WP or idler bearing. The only belt failures I ever heard about were ones with ridiculously high mileage, ie 200k +/-.

So, would you guys hesitate to install a Mitsuboshi timing belt? Thanks.

Re: Mitsuboshi Timing Belts [Re: artbuc] #5192627 08/21/19 05:21 AM
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Char Baby Online Content
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No hesitation! These are the only belts to use in my opinion.
Maybe this "someone who posted" about the Mitsuboshi/Aisin timing belt, may have installed them incorrectly?

We don't know all of the details or skill level of this particular "someone"!
Did this person cut corners?
Did this person NOT install a new tensioner?
What?...we just don't know the details.

Are there knockoff parts being sold around the world? We don't know this either!
In regards to quality:
Between Japan & Thailand, I choose Japan
Between Thailand & China, I choose Thailand
My understanding is that, Thailand has quite good quality coming out of their factories than China does.

Last edited by Char Baby; 08/21/19 05:43 AM.

"Retired"
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Mitsuboshi Timing Belts [Re: Char Baby] #5192631 08/21/19 05:34 AM
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artbuc Offline OP
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Originally Posted by Char Baby
No hesitation! These are the only belts to use in my opinion.
Maybe this "someone who posted" about the Mitsuboshi/Aisin timing belt, may have installed them incorrectly? We don't know all of the details or skill level of this "someone"!


He has over 9k posts on two different MDX forums and is Moderator on one of them. He considers himself to be an expert and it appears most readers see him as an expert. That is why I asked the question here. I have to assume he knows what he is talking about but his advice does not square with my experience or knowledge.

Re: Mitsuboshi Timing Belts [Re: artbuc] #5192636 08/21/19 05:53 AM
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Char Baby Online Content
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I suppose that we could get less than IDEAL parts quality/reliability of any product. Even products that are known for their quality/reliability.

I've actually owned Toyota's & Honda's that were less than satisfactory. Not disasters per say but certainly not what I would have expected from them. So, maybe this person may in fact have gotten some bad timing belts with the Mitsuboshi/Aisin name on them. And maybe they've all come out of Thailand.

Hard to tell but, I'd still use'em.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Mitsuboshi Timing Belts [Re: artbuc] #5192641 08/21/19 06:09 AM
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Char Baby Online Content
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Not saying that this person bought the TB online but...
In addition, I know lots of individuals(DIYers) who buy these timing belt kits off Amazon. However, IDK if they've had any issues. Where as, I also know lots of professional mechanics that buy these kits directly from the dealer and claim total success. It may cost more from the dealer but, they need'em now, not is 3-5 business days, And IDK if the pro's use Amazon/Prime for their business but, do use it for themselves.

Is the stuff from Amazon or any other online service, inferior to the dealer stock???


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Mitsuboshi Timing Belts [Re: artbuc] #5192660 08/21/19 06:50 AM
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Trav Offline
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I own a VW and a Saab that were both service by a "guru", friggin hacker butchered everything so don't go by that. Mitsuboshi timing belts are top shelf I would and do use them with no reservation.
They are made in Thailand for a reason. The Japanese belt companies built plants there primarily because it is closer to the raw materials and its cheaper to process it there than ship it to Japan. The plant are fully automated start to finish so it really makes no difference whatsoever as far as quality goes.

Rock sells correct parts and so does Amazon but with Amazon you have to be careful, buy only from Amazon or a known quality vendor selling on Amazon eg some tools are sold on Amazon by say Zoro and that is fine but some fly by night may be selling the same item and that's the one to avoid.


ASE L1, Master. Deutsch Meisterbrief.
Re: Mitsuboshi Timing Belts [Re: Trav] #5192667 08/21/19 06:59 AM
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Char Baby Online Content
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Well said!


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Mitsuboshi Timing Belts [Re: artbuc] #5192681 08/21/19 07:25 AM
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SubyRoo Offline
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I've used Mitsuboshi timing belts on most of my cars over the years and who knows how many customer cars. I wouldn't have any worries using one. High post count doesnt equate to knowledge or experience.


1999 Acura Integra GS-R 273K
1998 Honda CR-V EX 261K
2010 Mazda 3 60K
Re: Mitsuboshi Timing Belts [Re: Trav] #5192710 08/21/19 08:20 AM
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hallstevenson Offline
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Originally Posted by artbuc
He has over 9k posts on two different MDX forums and is Moderator on one of them. He considers himself to be an expert....

I stopped reading there ! Being a forum mod, in many cases, means a person often spends time getting their nose brown from higher-ups at forums ! grin Certainly doesn't mean they're experts, even though they themselves think they are !!

Originally Posted by Trav
They are made in Thailand for a reason. The Japanese belt companies built plants there primarily because it is closer to the raw materials....
Ding, ding, ding - there's the winning answer regarding why rubber belts are being produced in Thailand.

Guess what country is the largest rubber producer in the world ? Big name tire producers are making tires there too.

Re: Mitsuboshi Timing Belts [Re: Trav] #5192730 08/21/19 08:39 AM
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Pelican Offline
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Originally Posted by Trav
I own a VW and a Saab that were both service by a "guru", friggin hacker butchered everything so don't go by that. Mitsuboshi timing belts are top shelf I would and do use them with no reservation.
They are made in Thailand for a reason. The Japanese belt companies built plants there primarily because it is closer to the raw materials and its cheaper to process it there than ship it to Japan. The plant are fully automated start to finish so it really makes no difference whatsoever as far as quality goes.

Rock sells correct parts and so does Amazon but with Amazon you have to be careful, buy only from Amazon or a known quality vendor selling on Amazon eg some tools are sold on Amazon by say Zoro and that is fine but some fly by night may be selling the same item and that's the one to avoid.


Plus 100 on this one!

Re: Mitsuboshi Timing Belts [Re: artbuc] #5192787 08/21/19 09:45 AM
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What kind of car (make/model/year)?
Is it a widespread occurences or just 1 thread?


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Mitsuboshi Timing Belts [Re: artbuc] #5192847 08/21/19 11:10 AM
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The belts are fine, I have installed in a few. Are they identical to the OE part? Definitely not. But will they do the job? yes.

Subjectively, the belts feel a bit thinner than OE Honda belts.

For Toyota's, the Aisin kits are great and are almost identical to OE.

If price was a concern, I would have no problems using the Aisin kit.

Also, I am suspicious about the hydraulic tensioner that is included in the Aisin kits. The new ones now just have Aisin stamped in ink. Are they really OE or some relabeled part from a mysterious vendor?


2011 Toyota Prius 1.8L - 197K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4 - 138K - Mobil 1 EP HM 5W-30
Re: Mitsuboshi Timing Belts [Re: The Critic] #5192854 08/21/19 11:21 AM
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kschachn Offline
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Originally Posted by The Critic
Also, I am suspicious about the hydraulic tensioner that is included in the Aisin kits. The new ones now just have Aisin stamped in ink. Are they really OE or some relabeled part from a mysterious vendor?

For mine the OEM is made by NTN. When I last bought one in that kit it had NTN in the casting.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: Mitsuboshi Timing Belts [Re: kschachn] #5192857 08/21/19 11:23 AM
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The Critic Offline
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Originally Posted by kschachn
Originally Posted by The Critic
Also, I am suspicious about the hydraulic tensioner that is included in the Aisin kits. The new ones now just have Aisin stamped in ink. Are they really OE or some relabeled part from a mysterious vendor?

For mine the OEM is made by NTN. When I last bought one in that kit, it had NTN in the casting.

Exactly. The last two I have purchased did not have anything on the casting; it was only stamped with "Aisin" in ink.

Last edited by The Critic; 08/21/19 11:23 AM.

2011 Toyota Prius 1.8L - 197K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4 - 138K - Mobil 1 EP HM 5W-30
Re: Mitsuboshi Timing Belts [Re: The Critic] #5192858 08/21/19 11:26 AM
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kschachn Offline
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On the other hand Aisin is about the most reputable manufacturer I know, I don't think I would worry about anything they put in their kits.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
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