12 replies to this topic

[KobukKobuk]

Hi all.

 

One of the questions on the linked topic was why oil was not spraying between the rockers when I opened the rocker cover and started the engine,

so I opened the head again today to check.

https://www.theminif...-link-attached/

 

First, I sprayed WD40 on the oil line going from the engine head to the rocker post and checked that it came out on the other side.

also, the roller rocker oilline doesn't seem to be a problem too.

 

Next, I checked the small hole on the side of the engine block that touches the engine head,

and even when I put a stick in and pushed all the way in,there was only a slight stain and no engine oil.

 

I'm confused as to whether it's normal for the engine oil in this small hole to be halfway up like the holes next to it, or whether it could be clogged.

Are there any additional checks or actions I should take in this case? Or is there something I don't know? I would appreciate your advice.

 

Attached Files

•  20250105_012949.png   677.49K   5 downloads
•  20250105_012847.png   673.92K   4 downloads

Edited by KobukKobuk, 04 January 2025 - 04:36 PM.

[nicklouse]

Has the cam bearing on the front (fan end) of the engine been fitted correctly? That is the oil feed.

[imack]

Does oil squirt ot of that hole if you crank the engine using the starter motor?
It shouldn't be a constant flow of oil, it should be a pulsed flow.
Assuming you have oil pressure in the main gallery, if you don't get oil here when cranking the engine you've got a potential issue with the cam bearing or camshaft or the oil feed between the front main bearing and cam bearing is obstructed.

[r.tec]

A fellow racer frind of mine, Mano from Düsseldorf, once created this leaflet that used to be visible on his now defunct webside. Luckily I saved it to my pc.

 

I am afraid in German, but you can surely draw some information out of it:

 

 Mano Oelkreislauf 01.png   169.83K   20 downloads

 

 

[KobukKobuk]

Has the cam bearing on the front (fan end) of the engine been fitted correctly? That is the oil feed.

 

I've never replaced it before so I'm not sure if the holes in the bearing and block match up.

i can't take the engine out myself so I'm thinking of taking it to a mechanic if that's all I can do.

Thanks your advice.

 

[KobukKobuk]

Does oil squirt ot of that hole if you crank the engine using the starter motor?
It shouldn't be a constant flow of oil, it should be a pulsed flow.
Assuming you have oil pressure in the main gallery, if you don't get oil here when cranking the engine you've got a potential issue with the cam bearing or camshaft or the oil feed between the front main bearing and cam bearing is obstructed.

 

Are you saying to try cranking the engine without the head?

Please excuse my ignorance about maintenance

[KobukKobuk]

A fellow racer frind of mine, Mano from Düsseldorf, once created this leaflet that used to be visible on his now defunct webside. Luckily I saved it to my pc.

 

I am afraid in German, but you can surely draw some information out of it:

 

Mano Oelkreislauf 01.png

 

Thanks to Google, I now understand German ;)

thank you

[imack]

Does oil squirt ot of that hole if you crank the engine using the starter motor?
It shouldn't be a constant flow of oil, it should be a pulsed flow.
Assuming you have oil pressure in the main gallery, if you don't get oil here when cranking the engine you've got a potential issue with the cam bearing or camshaft or the oil feed between the front main bearing and cam bearing is obstructed.

Are you saying to try cranking the engine without the head?
Please excuse my ignorance about maintenance

Yes.
Obviously place lots of old rag around to catch any oil spillage.

[KobukKobuk]

 

 

Does oil squirt ot of that hole if you crank the engine using the starter motor?
It shouldn't be a constant flow of oil, it should be a pulsed flow.
Assuming you have oil pressure in the main gallery, if you don't get oil here when cranking the engine you've got a potential issue with the cam bearing or camshaft or the oil feed between the front main bearing and cam bearing is obstructed.

Are you saying to try cranking the engine without the head?
Please excuse my ignorance about maintenance

Yes.
Obviously place lots of old rag around to catch any oil spillage.

 

 

 

Thanks for the advice, imac.

I'll try cranking it without the engine head tomorrow.

 

[KobukKobuk]

 

 

 

Does oil squirt ot of that hole if you crank the engine using the starter motor?
It shouldn't be a constant flow of oil, it should be a pulsed flow.
Assuming you have oil pressure in the main gallery, if you don't get oil here when cranking the engine you've got a potential issue with the cam bearing or camshaft or the oil feed between the front main bearing and cam bearing is obstructed.

Are you saying to try cranking the engine without the head?
Please excuse my ignorance about maintenance

Yes.
Obviously place lots of old rag around to catch any oil spillage.

 

 

 

Thanks for the advice, imac.

I'll try cranking it without the engine head tomorrow.

 

 

 

I tried turning the crank about 3 times, but unfortunately no oil splattered. :'<

 

[KobukKobuk]

 -

Edited by KobukKobuk, Yesterday, 05:12 AM.

[imack]

You'll probably need to crank it for longer than that to get oil from that drilling even if there's nothing wrong.
Crank it until the oil pressure light goes out, or the gauge(if you have one) starts to show pressure.
You need to build pressure in the main oil gallery and feed the main and big end bearings before you see oil feed to the rockers.

Edited by imack, Yesterday, 05:04 PM.

[brivinci]

Yes! What he said!! The oil drains back out of a lot of the engine once switched off. Usually takes a bit to get the pressure back up. If your motor was to ever sit for a long time, its always best to pre-oil whatever you can, remove plugs, and crank it over till the light goes out of gauge starts to read before things start spinning really fast and create damaging heat.