Jump to content


Photo

help! replacing the timing chain on my 82 720 4x4.


  • Please log in to reply
42 replies to this topic

#41 Crashtd420

Crashtd420

    Datsun Mechanic

  • Senior Member
  • PipPipPipPipPip
  • 2,074 posts
  • Location:Massachusetts
  • Cars:1972 Datsun 521

Posted 28 January 2018 - 05:18 AM

A terrible development.......

I just put a compression tester on it an turned it over with a breaker bar (yes I put a plug in the other hole so just hang on a sec). And I got nothin, should I expect nothin when I turn it over by hand like that? Also when it got to compression on #1 it hisses! Maybe I have a bunch of busted valves ?:( Would that muck up my pistons too?


I don't think you can do a compression test like that.... I always thought it need a few cycles to the engine to get the number on the gauge to come up properly, and I believe you want to be holding the throttle wide open while cranking....
I usually crank it over till the gauge stops....

The hiss is probably from the valve not sealing properly to the valve seat....
The could be carbon on the valve, a nick in the seat or valve or even a tight valve lash holding it slightly open....

You could probably pull the plugs out and catch a view of the valves through the spark plug hole as you rotate the engine...

#42 captain720

captain720

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 607 posts
  • Location:Washington (the dry side)
  • Cars:1986 and 0 Nissan 720 King Cab 4wd and 2wd, 1991 Chevy S10 2wd

Posted 28 January 2018 - 08:46 AM

They look fine through the plug hope. I am tempted to take the head off just too have a look see as it is only 13 bolts. I just hope my blue wedge can hold the timing tensioner.

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

My channel https://www.youtube....KfpiwEzpECyevzw

 

Datsun=Project


#43 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 72,242 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 28 January 2018 - 10:10 AM

 At the moment the crank and cam are properly aligned so turning it with the starter is not going to do any harm.

 

If there is a hissing sound on #1 on the upward stroke to TDC then you have some compression. Try again maybe your method was faulty (get a second opinion) and use the starter


Posted Image