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TOPIC: Rebuilding the Engine! KZ750 LTD

Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182872

  • Johnny Red
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Ok Question,

Im rebuilding a 1981 KZ750 LTD,

This is where im at, I need to replace the oil seals in the transmisstion cover. I have the cover all cleaned and ready to go. Now I hear that I need to put it in the oven and heat it up to What Temp? to get the old seals out and at the same time put the new ones in!

Your Thoughts?

Thank Johnny Red!
kz750_01-4e87e0cbf606205ba27e62b5f1ce3800.jpg
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182874

  • The Milkman
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That's interesting,, where did you ever hear that you had to heat the case to replace the seal? Are the cases apart or still together?
The simplest way if they are still together is drill 2 small holes across from each other on the seal, drill just through the outer flat sheet metal then put a couple small sheet metal screws in the holes and pry the seal out. Replace by using a piece of pipe or a deep socket the same size as the outer circumferance of the seal, put some oil on the seal lip and the shaft and tap it back into the case straight.
78 650-C2, Stock engine, Jardine 4-2 Exh., 17-38 sprockets, dyna ignition and coils, coil wiring mod, carb mod.
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182875

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This is the cover that goes over the shifter rod and such.

tran_cover.jpg
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182877

  • Johnny Red
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Ok Update!

I put it in the oven @ 300 degrees for 15 mins.

The old seals came right out. I then made sure it was clean and put the new ones in, they when right in, then took a peace of small wood and rubber hammer leveled the seals in there holes.

Now I have to just let them cool down.
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182880

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Update Photo of Tranny cover seal
100_2846.JPG


Post edited by: Johnny Red, at: 2007/11/27 18:41
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182881

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Here is a close up of the final job.
100_2847.JPG
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182882

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Update! I figured since the metal exspands when heated..... Heat it up and presto! out with the old and in with the new!
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182893

  • The Gringo
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Johnny Red wrote:
Update! I figured since the metal exspands when heated..... Heat it up and presto! out with the old and in with the new!

Just don't be stupid enough to let your wife catch you doing it.:pinch: :pinch: :pinch:
Andy
Akron, Ohio
80 Z-1 Classic-Sold
84 GPZ1100
79 KZ 1000 LTD
78 KZ 1000 A2
77 KZ 1000 LTD-Sold
76 KZ 900 The definition of a barn find
76 KZ 900-Sold gone to Denmark
KZ 750 times 3, KZ 650 times 8 Sold 1 down to 7
KZ 550 times 2 80 440LTD-Sold
81 CSR 305-Sold 81 Yamaha XS650 Special
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182895

  • The Milkman
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Glad it worked for you,, ;) ;) ;)
Ride safe
78 650-C2, Stock engine, Jardine 4-2 Exh., 17-38 sprockets, dyna ignition and coils, coil wiring mod, carb mod.
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182913

  • badboie
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The Gringo wrote:
Johnny Red wrote:
Update! I figured since the metal exspands when heated..... Heat it up and presto! out with the old and in with the new!

Just don't be stupid enough to let your wife catch you doing it.:pinch: :pinch: :pinch:

haha this reminds me of a joke. "you know your a redneck when your wife tells you to take the engine out of the bathtub so she can take a bath":lol: :whistle:
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Re:Rebuilding the Engine! KZ750 LTD 6 years 7 months ago #182941

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This would be a "hot home made seal driver". Glad it worked. I would still use a good old cold seal driver to do the job.

Post edited by: hugo, at: 2007/11/28 09:07
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