1973 Z1 Maui

More
22 Jul 2022 08:40 - 22 Jul 2022 08:41 #870842 by Wookie58
Replied by Wookie58 on topic 1973 Z1 Maui

At this point nothing adds up....
According to all test performed and where oil  is observed oil flow is not the problem
1  oil is causing pressure gauge to show pressure at oil transfer  elbow
2 oil pressure if not allowed to flow from pump has cause some to have oil filter cover blowing seal or warping  ( breaking ) cover  at oil pan   ( Not reported here )
3 signs of oil to top of block  shows flow to head 
4 air blown thru head passages  shows no restriction 
Im at a loss for what is wrong  , So     start over 

Crank motor over to see unrestricted flow with head off to top of block 
If poor flow   pull  transfer elbow off from behind motor to check for plug from oil  cooler used priorly or a restriction in the area. This is biggest change you made by deleting the cooler from system
Next pull block and look for  restricted  oil supply from ports coming off cases and look for silicon in stud bores from prior assembly of motor
If all good  revist head issues.  
Do cams rotate  if installed on head off motor freely or do they bind ???  ( seperate from valve spring  tension  )
Assume nothing  ,,,Check the smallest detail
Use plastigauge  to check cam bearing  clearance
Good Luck nand let me know 
Dave


 
Absolutely agree with you, this is why I suggested the pressure check at the switch housing - any restriction or blockage related to the deleted cooler etc should cause the oil pressure to be higher than normal at this point   whist there is air flow and signs of oil at the head it is difficult to measure if it is anything like the high flow rated expected
Last edit: 22 Jul 2022 08:41 by Wookie58.

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 13:03 #870910 by MauiZ1
Replied by MauiZ1 on topic 1973 Z1 Maui
As I go through looking at everything, including the books and photos, I have noticed one thing that I’m not sure of. The top cam chain gear idler between the cams looks symmetrical. I’ve seen it installed in my books both ways. I marked mine with an arrow upon initial disassembly. What if it’s backwards? I don’t see how it would cause my problem but worth asking.

Please Log in or Create an account to join the conversation.

  • Scirocco
  • Away
  • Premium Member
  • Never change a running system
More
23 Jul 2022 15:10 - 23 Jul 2022 15:15 #870913 by Scirocco
Replied by Scirocco on topic 1973 Z1 Maui
The Top Cam Chain Idler can be used both ways! He is made/build to the center of cam chain with no off set any way.
Only the dis-integration of the cam chain gear rubber damper part can cause an off set.

 
Last edit: 23 Jul 2022 15:15 by Scirocco.

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 15:15 #870915 by MauiZ1
Replied by MauiZ1 on topic 1973 Z1 Maui
I’m going to try a pre-prime setup to fill the upper oil passages before spinning it with the starter.
im waiting for a gauge as well.
im grasping at straws here

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 15:39 #870918 by Wookie58
Replied by Wookie58 on topic 1973 Z1 Maui

I’m going to try a pre-prime setup to fill the upper oil passages before spinning it with the starter.
im waiting for a gauge as well.
im grasping at straws here


 
Have you removed the bung and checked for a cooler restrictor as mentioned previously
 

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 15:40 #870919 by Mikaw
Replied by Mikaw on topic 1973 Z1 Maui
Need to figure out how to do something like this. Not compression testing, turning the engine with an external source

fb.watch/escvlIBDEK/

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 15:51 #870920 by MauiZ1
Replied by MauiZ1 on topic 1973 Z1 Maui
Yes, l took out the bung and all is clear
The following user(s) said Thank You: Wookie58

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 16:44 #870922 by Wookie58
Replied by Wookie58 on topic 1973 Z1 Maui
Before risking more damage could you make a gasket for the switch housing with no hole on the switch side to block the oil pump, then suspend a container of oil as high as possible above the bike and gravity feed it into the bung hole. Current atmospheric pressure in Hawaii is 14psi. Given that this is a high flow system the container should drain relatively quickly (random I know)
 

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 19:19 #870925 by MauiZ1
Replied by MauiZ1 on topic 1973 Z1 Maui
Kind of what I’m planning.
bucket test of oil pump, for what it’s worth
 
Attachments:

    F6566CA4-1...9A52.MOV

Please Log in or Create an account to join the conversation.

More
23 Jul 2022 19:20 #870926 by MauiZ1
Replied by MauiZ1 on topic 1973 Z1 Maui

one more try

Please Log in or Create an account to join the conversation.

More
24 Jul 2022 01:44 - 24 Jul 2022 01:48 #870931 by Wookie58
Replied by Wookie58 on topic 1973 Z1 Maui
Kind of what I’m planning.
bucket test of oil pump, for what it’s worth
 
I was thinking more about a flow test through the motor, with a gravity fed supply to the gallery you could loosen each of the four outer head nuts in turn and see how much flow you have coming up to the head (ref Z1015's advise about HD studs)
  1. if the flow is poor consider drilling as advised or replace studs with stock
  2. if the flow is good consider removing the gallery bungs on the head as mentioned previously and inspect the gallery's 
I know this problem is getting you down but "stay the course" you have done to much to "give up" you will get there 
Last edit: 24 Jul 2022 01:48 by Wookie58.

Please Log in or Create an account to join the conversation.

  • hardrockminer
  • Offline
  • Sustaining Member
More
24 Jul 2022 04:00 #870933 by hardrockminer
Replied by hardrockminer on topic 1973 Z1 Maui
I think I mentioned earlier that I once had to tear an engine down completely five times before I found that I had a non standard transmission that was causing the kickshaft to grind on the trans gears.  (It was a close ratio transmission option offered by KHI back in the day, but it required removing the kickshaft.)  It was frustrating but I had faith that eventually with advice from others I would find the cause.  And I did.  The payoff for you will be the immense sense of satisfaction when you finally solve this mystery.

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
The following user(s) said Thank You: Wookie58

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum