Where is it coming from? I'm mystified.

 

The dreaded dowel pin oil leak...and, no, JBWeld will not fix this...just keep the oil topped off and ignore all the people laughing at "Old Smokey" once that stuff starts to find its way to your exhaust...the only real cure is an engine rebuild...

 

Hmm. The engine was rebuilt 5k miles ago, and in fact it was doing it since it was just rebuilt .

 

Are you sure it isn't just leaking from the oil filter? It is basically right above where the the oil is.

 

It's coming out of the hose from the oil filler tube. Adjust that clamp a little.

 

From my search on dowel pin oil leak I got that the puddle forms usually on the front rotor. The front rotor are where it says MAZDA is clean and dry. This is the rear rotor. Could it still be the dowel pin leaking oil?

 

That clamps is tight. I tightened it up a 1/8 of a turn just now. Somehow doesn't seem to be coming from there though.

 

Looking at the picture, I don't even think it's all the way on the nipple coming from the filler neck. Try pushing it further in.

 

if it is a dowel pin leak, the only thing i can ask is if u used black RTV around the area of the dowel pins? i know atkins recommends this on their video, they say if you don't do it your dowel pins WILL leak... i dunno, just asking, gotta cover all bases eh

 

No, it isnt the dowel pin leak, check the blue silicon hose again, it looks pretty wet. Also, If there was a leak at the OMP lines leading the carb, the oil would pool there. So check the OMP lines!!!
The Dowel pin leak is at the sides the block, and wouldn't pool like that at the top. He has a bad connection, or a leaky line.

 

I don't know if this is a dowl pin leak or not but oil WILL collect here on engines with the dowl pin leak. Been there with one of my engines before.

 

hey our leak is just like the leak in the photo except on the front rotor. oil seems to run down onto the plugs from the outside. it puddles at the top of the front rotor is well.....so far does my problem sound likea dowel pin oil leak?

Thanks,
Ron

 

thats the breather. all you have to do is drill and install a small L fitting in the oil cap. plug up those lines and you should be fine.

 

Thanks for the replies guys. So I cleaned the area real well, took the car for a short run, and this is what it looks like now:







It would seem that is sliding down from the seam between the rear housing and the rear plate, and then forming a little puddle down over the MAZDA symbol.

 

It's not coming out at idle, is it? Was there any on the bottom of the blue hose coming from the filler tube?

 

No, not that I can see anyways. It took several mins of spirited driving to get those few drops worth over the "DA" in the MAZDA characters.

Bottom of the blue hose is dry. as you can see, actually to the left of the small little puddle starting to form, is all dry, as in over the letters "MAZ". so it's gotta be coming from above, not from the left.

 

My thinking was that it ran down the hose and dripped there. If that's the source of your leak, it wouldn't leak at idle either.

 

I have a small puddle that forms on the same location on the front rotor. So if it puddles on the top of the housing beside the Mazda tag it's not the dowel pin leak? I understood this is where it would leak. Someone set me staight here. If it's not, what else could it be on the front rotor?

 

Oh no, that hose stays dry. That's not the source of the leak, fo sho.

 

Get a UV light and put oil dye in the oil. Clean off the area, then run the car for 5 minutes, and hit it with the uv light. Best use the yellow glasses, they help out a ton. And try to do it in a dark garage. I know you just cleaned it, but clean it again, it'll help. I've heard occasinally, that the o-ring in the oil filter stem (the part the oil filter mounts on) can go bad.

 

I have a small puddle that forms on the same location on the front rotor. So if it puddles on the top of the housing beside the Mazda tag it's not the dowel pin leak? I understood this is where it would leak. Someone set me staight here. If it's not, what else could it be on the front rotor?

 

Oil filter itself is leaking(base oring)
Oil filter pad orings are leaking(common)
Dowel pins are leaking(less likely since it was rebuilt)
Breather system isnt hooked up right and causing blowby oil vapor to collect.(common on bareblock setups)
Theres more to the crankcase ventilation system than just running a hose from the filler tube to the carb.Do you ever get milky sludge in the filler cap?

BTW,only flourolined silicone hose should be used for oil or fuel.If that blue line isnt deteriorated/torn yet,it will be soon from the oil laden vapor.

 

Why the hell dosent anyone listen to the "Experienced Ones"

I told you the problem like 10 times cdrad51.....


JEEZZZEEE ! !

HERE...... (walking outside to take a DETAILED pic)


-Ryan

 

 

see the lil nipple that I HAVE BEEN telling you about...