No Oil to head (tube)

[zesinlijn]

Problem solved :-)

[whodwho]

Glad you got it solved, so the lack of those drilled passages was what caused no oil in the tube?

[zesinlijn]

Jup drilling the 3 extra holes was the solution. got oil to all the bearings and to the sprayerbar now :-)

[michael_rpt]

I have the same problem with my s eta head 885, schrick assymetric cam intended to 325i m20b25.
Can you please show some pictures of the exact places of holes you drilled?

[digger]

I have the same problem with my s eta head 885, schrick assymetric cam intended to 325i m20b25.
Can you please show some pictures of the exact places of holes you drilled?

im pretty sure this is your issue. The middle journal does not get oil

[michael_rpt]

im pretty sure this is your issue. The middle journal does not get oil

I seeked for some pictures while the head was beeing rebuilt and probably arm shafts were installed correctly.
Digger would you please show me where the holes should be drilled?

[digger]

you need to repliacte the m20b25 head

this is a M20B25 head. the red holes on your head are probably missing and need to be added


This is a M20B27 SETA head like you have. the green holes are not on the M20B25 but these can be left as is. add the red holes.


this is the ETA cam you can see the middle journal and journal 2 and 6 are missing and the full 360 degree groove is on the 3 and 5 journals (green holes transfer oil from one rocker shaft to the other through the cam groove on the ETA and SETA engines)


The m20b25 cam has only a single full 360 degree groove on the middle (no4 journal)

the holes are drilled on an angle simply replicate the existing angled holes

[michael_rpt]

SO,
As far as my engineers brain understands correctly I need to drill the holes through the head to reach the camshaft, not only to the arm shafts, right?

[digger]

Correct the important part is the hole between the journal and rocker shaft bore . The hole on top is blocked off by the shaft. The hole must align with hole in the rocker shaft so it’ requires precision.

[michael_rpt]

Ok, last time- I need to be clear. Are you sure you marked the holes properly?
Seta head already has the hole in the middle journal between camshaft and rocker shaft on the exhaust side „B” but it’s not visible on the top.
Seta head doesn’t have any hole in place „A”, should it be?
Seta camshaft has the oil passage on journal 3rd and 5th, camshaft from b25 has the oil passage on 4th journal.
Please take a look at my drafts.

My conclusions are following:
In b25 head oil comes to the intake arm shaft ONLY through the middle - 4th journal.
In SETA head oil comes to the intake arm through 3rd and 5th journal.
Puting b25 camshaft into the SETA head without drilling holes will cause total lack of oil in the intake arm shaft and on the camshaft.
Do I understand this issue correctly?

[digger]

Ok, last time- I need to be clear. Are you sure you marked the holes properly?
Seta head already has the hole in the middle journal between camshaft and rocker shaft on the exhaust side „B” but it’s not visible on the top.
Seta head doesn’t have any hole in place „A”, should it be?
Seta camshaft has the oil passage on journal 3rd and 5th, camshaft from b25 has the oil passage on 4th journal.
Please take a look at my drafts.

My conclusions are following:
In b25 head oil comes to the intake arm shaft ONLY through the middle - 4th journal.
In SETA head oil comes to the intake arm through 3rd and 5th journal.
Puting b25 camshaft into the SETA head without drilling holes will cause total lack of oil in the intake arm shaft and on the camshaft.
Do I understand this issue correctly?

yes, you also need hole "A" so that oil gets into the inlet rocker shaft.
Hole C should be required on all heads, it gets oil from bolt hole to the exh rocker shaft. i dont think you can have C without D
Hole B there needs to be an oil passage from exh rocker shaft to the camshaft main groove

[michael_rpt]

yes, you also need hole "A" so that oil gets into the inlet rocker shaft.
Hole C should be required on all heads, it gets oil from bolt hole to the exh rocker shaft. i dont think you can have C without D
Hole B there needs to be an oil passage from exh rocker shaft to the camshaft main groove

Thank you very much for patience, now I clearly understand how those heads work. I will have my head drilled and let know when engine is pulled up together and running.
One more thing, do you think that leaving stock holes on the exh side on 3rd and 5th journal will not cause any problems, like oil preasure for ex? It seems like camshaft will have double oil portion here.
😌

[michael_rpt]

Problem solved (: