Oil leaks after rebuild, Dropping motor to track down oil leaks Options

[Wew]

Hi all,

Engine rebuild has not gone as smooth as I had hoped.

I am dropping the engine again to figure out the source of my leaks.

I have drips coming from a couple of the tube on the passenger side under the oil cooler.

Tough to tell if it's the cooler or the tubes.

Cylinder 3 is giving me the most concern.

It almost looks like one of the four cylinder studs is leaking oil.

I can't tell exactly as it could be the actual mating surface of the cylinder and the block.

Anyway I am dropping the motor to track these down.

Has anyone else come across oil leaking out of a stud or is this just the cylinder and engine mating surface leaking?

If it is how have any of you remedied this?

Is there a bullet proof sealant that others have used to stop this?

Attached is an image I borrowed online that shows the location of where I see oil coming from.

Thanks for sharing as always.

[Mark Henry]

Where's the underside cooling tin?

What did you use to seal the cylinder to the case ?
Studs I put in with red loctite.

I'm happy if I have no drips, slight weeps are a given...it's an aircooled.

[wonkipop]

Where's the underside cooling tin?

What did you use to seal the cylinder to the case ?
Studs I put in with red loctite.

I'm happy if I have no drips, slight weeps are a given...it's an aircooled.

i understand mark you are referring to what appears to be missing are the baffle tins located above the pushrod tubes normally and look like they are not there in the photo.

not warm air guides which are lower down?

i know back in the 80s there were two schools of thought on the lower warm air guides.
personally i believe the lower guides simply squirt or help direct the already heated cooling air that has done its job and try to direct that air towards the back of the car.
the big problem with a 914 is the heated air builds up under the car when it is at stand still in traffic idling compared to a regular rear engined VW where the air can just squirt out the rear without building up underneath. i know this because i live in australia and it can be very evident on a hot day here just how hot it can get underneath when the car is running but standing still. i'm not sure in the end the lower air guides do much really. maybe save the clutch and accelerator cables. i removed mine with the rusted out heat exchangers way back in the late 80s. the guides were rusted along with the heat exchangers. my american porsche mechanic back then explained what he believed the lower air guides did and it was 50 50 whether they really did push that hot air out from under the car any better than if they were not there.

it would be very dangerous to run a 914 engine without the baffle tin ware that is above the pushrods. those baffles are there to bend the air across the bottom of the cylinders and heads. thats going to cook an engine real fast if they are left off.

[Mark Henry]

Where's the underside cooling tin?

What did you use to seal the cylinder to the case ?
Studs I put in with red loctite.

I'm happy if I have no drips, slight weeps are a given...it's an aircooled.

i understand mark you are referring to what appears to be missing are the baffle tins located above the pushrod tubes normally and look like they are not there in the photo.

not warm air guides which are lower down?

i know back in the 80s there were two schools of thought on the lower warm air guides.
personally i believe the lower guides simply squirt or help direct the already heated cooling air that has done its job and try to direct that air towards the back of the car.
the big problem with a 914 is the heated air builds up under the car when it is at stand still in traffic idling compared to a regular rear engined VW where the air can just squirt out the rear without building up underneath. i know this because i live in australia and it can be very evident on a hot day here just how hot it can get underneath when the car is running but standing still. i'm not sure in the end the lower air guides do much really. maybe save the clutch and accelerator cables. i removed mine with the rusted out heat exchangers way back in the late 80s. the guides were rusted along with the heat exchangers. my american porsche mechanic back then explained what he believed the lower air guides did and it was 50 50 whether they really did push that hot air out from under the car any better than if they were not there.

it would be very dangerous to run a 914 engine without the baffle tin ware that is above the pushrods. those baffles are there to bend the air across the bottom of the cylinders and heads. thats going to cook an engine real fast if they are left off.

In the picture I was talking about the under cylinder (above PR) tin, I don't care if you live in Alaska you have to have these tins. The heat exchanger bottom tins I like to use up here in Canada, but it's not a must have. Obviously you can't even use the heat exchanger tins with headers.

Likely the pic the OP pulled from the net is from a DTM or Joe Cali upright fan conversion engine and these deflectors a modifided type1 and you can't see them in the pic.

[wonkipop]

Where's the underside cooling tin?

What did you use to seal the cylinder to the case ?
Studs I put in with red loctite.

I'm happy if I have no drips, slight weeps are a given...it's an aircooled.

i understand mark you are referring to what appears to be missing are the baffle tins located above the pushrod tubes normally and look like they are not there in the photo.

not warm air guides which are lower down?

i know back in the 80s there were two schools of thought on the lower warm air guides.
personally i believe the lower guides simply squirt or help direct the already heated cooling air that has done its job and try to direct that air towards the back of the car.
the big problem with a 914 is the heated air builds up under the car when it is at stand still in traffic idling compared to a regular rear engined VW where the air can just squirt out the rear without building up underneath. i know this because i live in australia and it can be very evident on a hot day here just how hot it can get underneath when the car is running but standing still. i'm not sure in the end the lower air guides do much really. maybe save the clutch and accelerator cables. i removed mine with the rusted out heat exchangers way back in the late 80s. the guides were rusted along with the heat exchangers. my american porsche mechanic back then explained what he believed the lower air guides did and it was 50 50 whether they really did push that hot air out from under the car any better than if they were not there.

it would be very dangerous to run a 914 engine without the baffle tin ware that is above the pushrods. those baffles are there to bend the air across the bottom of the cylinders and heads. thats going to cook an engine real fast if they are left off.

In the picture I was talking about the under cylinder (above PR) tin, I don't care if you live in Alaska you have to have these tins. The heat exchanger bottom tins I like to use up here in Canada, but it's not a must have. Obviously you can't even use the heat exchanger tins with headers.

Likely the pic the OP pulled from the net is from a DTM or Joe Cali upright fan conversion engine and these deflectors a modifided type1 and you can't see them in the pic.

thanks mate.
in agreement.

i've been looking out for the exchanger guides for a few years.
you seem to be able to pick up the lhs ones no trouble, but i have not seen a rhs one (clutch speedo cable side) for sale in all that time. for whatever reason they seem to not be available from any source, repro or used. i'm pretty relaxed about not having those bits of tin but would be happy to put them on if i could ever find some. i think what they do is send as much of the exhausted cooling air towards the under trunk space as possible and alleviate build up of heat under the forward section where the engine is to help with the fuel pump where it was originally located in most cars. its pretty hard for the heat not to build up under a 914 at standstill due to the mid engine. whatever the flow of air out of the oil cooler ends up down there anyway?

interesting info re the upright fan conversion. for bugs i guess where they fit type 4 engines?