Timing Gears

timjuhl · Post by **timjuhl** » Wed Jun 01, 2016 4:39 pm

Any good advice for someone about to replace the timing gears in a F134 Hurricane Engine?

Actually, my mechanic is taking the lead on this one but he has never done a Hurricane and is trying to anticipate any problems before we start taking parts off.

Thanks!
Tim

Post by **wesk** » Wed Jun 01, 2016 8:41 pm

Just follow the book. Care with the fiber driven gear is important. Many cheaper aftermarket fiber gears are showing up with no timing mark. Also do NOT hammer gear on. Pull it on with the bolt and washer. If you hammer it on you will knock the rear cam bearing housing welsh plug loose and end up pulling the engine and flywheel to install a new one.

Use correct puller.

Establishing a timing mark on a blank timing gear.

Cam welch plug

timjuhl · Post by **timjuhl** » Sun Jun 05, 2016 3:31 am

The gears are coming from NAPA so who knows? I assume from your post that the gear used on the M38 (pictured) is the same on the Hurricane in the M38A1.
Thanks again!
Tim

southpw · Post by **southpw** » Sun Jun 05, 2016 7:08 am

timjuhl wrote:The gears are coming from NAPA so who knows? I assume from your post that the gear used on the M38 (pictured) is the same on the Hurricane in the M38A1.
Thanks again!
Tim

Yes Tim, same gears used on both engines. I just pulled those gears from an L and F head. I didnt have the right puller and broke the fiber gear into pieces. Then i couldnt get the remaining steel ring of the gear off the shaft. Much easier with proper puller. Luckily the F head was going to be sold in "as is" condition.

timjuhl · Post by **timjuhl** » Sun Jun 05, 2016 5:05 pm

Any suggestions as to a good source for a replacement front crankshaft seal? I'm assuming it will require replacement as part of the gear replacement process.

Post by **wesk** » Sun Jun 05, 2016 10:24 pm

Your local Napa or Carquest or Bearing Store will have that front cover seal.

New VICTOR REINZ P/N: 49575

http://www.rockauto.com/en/moreinfo.php ... 21&jsn=389

GPA · Post by **GPA** » Tue Jun 07, 2016 6:27 am

Tim, If you have done only the chain type, than don't worry because the gear type version is easier to do.

timjuhl · Post by **timjuhl** » Wed Jun 08, 2016 8:44 pm

It took most of the day but the new gears are in and the Jeep is back from the dead. The original phenolic gear was stamped Willys-Overland so it may well be over 60 years old. I compared the new steel gear to the original and decided to swap them out. The new gear has slightly beveled teeth and is polished smooth, while the original gear has pretty sharp edges.

I doubt the damage to the original phenolic gear happened all at once but finally got to the point where the teeth no longer engaged. Here is a photo comparing the old and new gears.

Tim

RICKG · Post by **RICKG** » Thu Jun 09, 2016 8:55 am

Don't toss that old gear Tim, dress it and re-purpose it as a hockey puck or paperweight!

timjuhl · Post by **timjuhl** » Thu Jun 09, 2016 4:29 pm

I plan to add it to my collection of "parts that seriously depleted my retirement account...."

timjuhl · Post by **timjuhl** » Tue Jun 14, 2016 9:12 pm

I forgot to add that the gear I got from NAPA was marked "Made in USA" and had the timing dot. We simply lined the dots up and it worked!

southpw · Post by **southpw** » Wed Jun 15, 2016 4:00 am

I wish my local Napa could look up parts for my 52. If i dont have a modern part number for them to search, its useless going there. Too bad as i have found they are cheaper than buying from the USA and getting it shipped north of the border.

4x4M38 · Post by **4x4M38** » Wed Jun 15, 2016 5:16 am

Brad,
Have them look up an early 1950's CJ3A.

Most of the engine, tranny and transfer
parts are interchangeable, except for the
military specific stuff.

Brian

4x4M38 · Post by **4x4M38** » Wed Jun 15, 2016 5:42 am

Here is a NAPA crossover list primarily
for the G503 WWII jeep, but many parts
are interchangeable. Not things like the
timing gears if course.

http://www.1943mb.com/np-66-0-G503_WWII ... nline.aspx

If I'm shopping NAPA I take the part with
me and compare with what they have. Or
will have. In most cases they'll have to
order what you need.

Then again, many if these parts are available
from our friendly neighborhood MV suppliers,
who in most cases have exactly what you need
once they know what you are putting it in.

southpw · Post by **southpw** » Wed Jun 15, 2016 6:16 am

Thanks Brian. Napa Canada uses different part numbers. Ive tried giving them a US part number and they cant do anything with it. But here i could at least use the US number and try and cross reference myself to find the CDN part number.
I appreciate the link.

Timing Gears

Timing Gears

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Timing gears

Timing Gears

Timing gear

Timing Gear