1973 Z1 Maui
- Wookie58
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Re: 1973 Z1 Maui
22 Jul 2022 08:40 - 22 Jul 2022 08:41Absolutely 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 pointAt 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
Last edit: 22 Jul 2022 08:41 by Wookie58.
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- MauiZ1
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Re: 1973 Z1 Maui
23 Jul 2022 13:03
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.
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- Scirocco
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Re: 1973 Z1 Maui
23 Jul 2022 15:10 - 23 Jul 2022 15:15
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.
Only the dis-integration of the cam chain gear rubber damper part can cause an off set.
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
Last edit: 23 Jul 2022 15:15 by Scirocco.
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- MauiZ1
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- Wookie58
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Re: 1973 Z1 Maui
23 Jul 2022 15:39Have you removed the bung and checked for a cooler restrictor as mentioned previouslyI’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
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- Mikaw
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- MauiZ1
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Re: 1973 Z1 Maui
23 Jul 2022 16:44
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)
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Re: 1973 Z1 Maui
24 Jul 2022 01:44 - 24 Jul 2022 01:48
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)
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)
- if the flow is poor consider drilling as advised or replace studs with stock
- if the flow is good consider removing the gallery bungs on the head as mentioned previously and inspect the gallery's
Last edit: 24 Jul 2022 01:48 by Wookie58.
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- hardrockminer
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