Coolant leak


9 replies to this topic
  • Barbados-WR

Posted August 22, 2005 - 02:45 PM

#1

Sometimes coolant is leaking through small hole below water pump housing located on crankcase cover (right). Anyone know why ?

1998 YZ 400F

  • walent215

Posted August 22, 2005 - 03:31 PM

#2

must be the water pump seal or shaft or both.all easy fixes

  • ONLY4STROKES

Posted August 22, 2005 - 04:25 PM

#3

Yes, you have a blown water pump seal.

  • PurpleHaze896

Posted November 27, 2005 - 02:47 PM

#4

i'm having the same problem as well. I know that i need the oil and water seal and the impeller shaft. I see the shaft and oil seal on this diagram but i dont see which one the water seal would be.

Posted Image

1: SHAFT, IMPELLER
((5JG5)) 298498-001 $23.93
2: IMPELLER, WATER PU
(5NX1) 295711-001 $48.47
3: WASHER,PLATE
(5NX1) 346834-001 $2.34
4: OIL SEAL
(5NX1) 358878-001 $3.00
5: OIL SEAL,SD-TYPE
(SD 12-22-5 HS) 4983-001 $4.47
6: BEARING
(B6001) 1121-001 $11.37
7: COVER, HOUSING
((5JG5)) 295069-001 $44.05
8: O-RING
((5JG1)) 295070-001 $5.88
9: PIN,DOWEL
(USA) 799-001 $0.73
10: GASKET
(5NX1) 796-001 $1.74
11: DISCONTINUED
(6X25) 363933-001
$0.93
12: PIPE, WATER
((5JG5)) 295076-001 $2.94
13: O-RING
(UR YAMAHA) 359108-001 $1.06

  • Barbados-WR

Posted November 27, 2005 - 04:29 PM

#5

#4 is your "water seal" ,#5 is your "oil seal" . Buy those 2 seals along with shaft and bearing #6 . Problems Gone !!!! :applause:

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  • PurpleHaze896

Posted November 27, 2005 - 08:25 PM

#6

alright, thanks a lot

  • stvmoto

Posted December 08, 2005 - 08:51 PM

#7

My bike leaks out of the same hole on the water pump.For me I noticed it just recently started leaking.The only difference is it only dribbles out a little bit of water then when the bike gets warm it stops???.......Any ideas anyone???

  • yamaboy23

Posted December 09, 2005 - 08:50 AM

#8

change the seal

  • MotoGoalie

Posted December 09, 2005 - 01:26 PM

#9

Sometimes coolant is leaking through small hole below water pump housing located on crankcase cover (right). Anyone know why ?

1998 YZ 400F


Hey, I was just in Barbados. Where do you ride. I did the Queens Route tour with a bunch of old fogeys. :applause:

  • slopoke

Posted December 11, 2005 - 05:39 PM

#10

ya...same problem...sorry to dredge up this old thread, but i searched first!!...lol....so how do you know which you've blown?? why do these blow in the first place?? i just put the whole bike back together after my motard build and i was riding up and down the block...it started to dribble water out of the little hole....you don't always need a shaft do you?





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