Oil leak 1.8t

[Ward123]

1.8t oil leak left hand side of the engine to rear more on the side of the engine is this the pcv system help

[Guest]

possibly main crank seal, or rocker gasket....where is it wet to start top or underneath ? 

[Ward123]

It isent the rocker gasket as just had a service and plugs no oil on them it is weton a metel theing just beside the air box on the left of the engine looks to me near the pcv stuff 

Edited 1 November, 2017 by Ward123

[Ward123]

Wet arond the bottom aswell

[Guest]

6 minutes ago, Ward123 said:

It isent the rocker gasket as just had a service and plugs no oil on them it is wer on a metel theing just beside the air box on the left of the engine looks to me near the pcv stuff 

they wont change the rocker cover gasket in a service. the pcv system wont leak oil like this but cause a vac leak and you will see this on the fuel trims as a + correction adding more fuel 

[Ward123]

Just had belt done if it was a crank seal it would be leaking on the right not the left as this is where the leak is coming from 

[Guest]

how much oil have you had to top it up ? 

[Guest]

1 minute ago, Ward123 said:

Just had belt done if it was a crank seal it would be leaking on the right not the left as this is where the leak is coming from 

you have 2 seals.... a crank seal on the pulley side and a main seal on the clutch side.

[Ward123]

Just had a oil change not losing much at all so is the seal on the left there is it easy to change 

[Guest]

2 minutes ago, Ward123 said:

Just had a oil change not losing much at all so is the seal on the left there is it easy to change 

well the clutch side is gearbox off job. but is not difficult on the fwd 1.8t. will need a few tools and good investment equipment like a engine crane and a transmission jack. but looking around the bay, if the oil leak is from higher up above the gear box it is not that. and more likely the rocker gasket, oil filter gasket, the oil filter gasket not put on right, that will cause the oil to go over to the gearbox side and drip down 

[Guest]

so check around the oil filter housing. have you got pictures ? 

[Ward123]

Oil filter housing is ok it is above the oil filter just under the airbox pipe it is a metel thing on the side of the engine looks like a pcv valve to me it is leaking under that 

[Ward123]

This is not my engine but you can see a silver disc thing just under the pipe thats what is leaking under it any ideas 

[kentphil1]

That is the combi valve for the SAI system. There is a gasket under the valve, there is also a gasket under the timing chain tensioner that lives just above that. The 1.8t has a cambelt to the exhaust cam on the drivers side of the engine, but a camchain between the inlet and exhaust cams on the left of the engine that is oil pressure driven. That is left and right as you sit in the car or reversed when looking in the engine bay.

 

The best option is to degrease that area of the engine and clean it as best you can, then run it for a day or so and look where the new oil is actually coming from with some degree of certainty, because at the moment we are all making educated guesses based on limited information at the moment.

 

Hope it helps,

 

Phil.

 

 

[Ward123]

Well the oil is under this so it must be the gasket is it easy to change 

[kentphil1]

Are you sure it is coming from that gasket or running down from the tensioner and ending up under the combi valve?. the combi valve is not to sifficult, but the tensioner gasket requires a special tool to compress the tensioner to release the chain from the cams to enable the tensioner to lift out of the way - not so simple, but well within the scope if you have had an engine to pieces before. If you haven't, I would let a pro do that one.

 

The thing about oil is it can be almost invisible to the naked eye unless it is leaking a fair quantity, and fairly old oil. It has to run about 3cm from the tensioner to the combi valve so could easily look like it is coming from it. Have a good clean, cross your fingers and hope you are lucky.

 

Just a thought here, to do the belt correctly, the cambox should not be removed, but many specialists do this on higher mileage cars to check the rear cam chain timing marks are correct in relation to the front cambelt marks - I think there may even be a mileage recommendation on the chain from main dealers - 120000 seems to come to mind when I had my first belt done in a main agent a few years back. This which would mean you should really fit a new cambox gasket. This involves putting a little sealant at the front and rear camshaft caps to seal the gasket correctly. If the sealant has been missed, it would weep oil, which is almost exactly in the area that you are looking. It may be worth having a polite word with whoever did your belt just to make sure if they have removed the cover, all is good in that area. A bit of info to put some meat on the bones of what I mean -

http://workshop-manuals.com/skoda/octavia-mk1/drive_unit/1.8_ltr./132_kw_engine_mechanical_components/enginecrankshaft_group_pistons/removing_and_installing_tightening_the_timing_belt/

http://workshop-manuals.com/skoda/octavia-mk1/drive_unit/1.8_ltr./132_kw_engine_mechanical_components/engine_cylinder_head_valve_gear/repairing_valve_gear/

 

Combi valve Info as well - http://workshop-manuals.com/skoda/octavia-mk1/drive_unit/1.8_ltr./132_kw_engine_mechanical_components/exhaust_system/secondary_air_system/removing_and_installing_parts_of_the_secondary_air_system_summary_of_components/

[Guest]

looks like its your tensioner gasket then, pcv wont leak like this from the cam cover breather unless the bucket splash caps were not installed. its easy enough to change but you need a good few tools 

[Leeboy]

Have a look here at my project thread, page 7:

For a long time I was convinced it was the cam cover gasket and changed it twice to no avail.  The oil was covering the top of the gearbox and everything else in the vicinity. 

 

Off came the chain tensioner once the inlet cam was removed and 4,000 miles later and it's still dry.  My work was made easier by previous deletes around that side of the engine, took me a morning of working slowly.  Having done it once, I could probably do it in half the time now.

[Ward123]

Thanks every one for your replys im going to have to degrease the area and start to clean it and run it and then investigate i just got told i had a slight oil leak after my service