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4JH1 Timing Gear on 4JB1T

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4JH1 Timing Gear on 4JB1T

Postby elmo89 » Mon Oct 12, 2020 5:43 pm

Is it possible to use 4JH1 timing gears on the 4JB1T engine? Do I need any modification on my engine? The stock gear ran too loud and one of my friend suggest me to switch to 4JH1 timing gear as it has finer teeth thus ran much more quieter.
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Re: 4JH1 Timing Gear on 4JB1T

Postby isuzurob » Thu Oct 15, 2020 6:07 pm

Can run all of the gears other than the injector pump gear, so short answer is no they don't all fit, the 4jh1 is quieter because they run spring loaded idler gear on the injector pump and the 4jb1 doesnt
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Re: 4JH1 Timing Gear on 4JB1T

Postby paulthepilot5 » Mon Nov 09, 2020 10:04 pm

elmo89 wrote:Is it possible to use 4JH1 timing gears on the 4JB1T engine? Do I need any modification on my engine? The stock gear ran too loud and one of my friend suggest me to switch to 4JH1 timing gear as it has finer teeth thus ran much more quieter.


The timing gear case and gears are all interchangeable as a full set. The JH1 pump gear won’t fit the JB1 mechanical pump though. I’ll actually be making adaptors for JH1 timing case and gear for mechanical pump conversions.
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