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Rear engine oil seal:

1. During the last OKA trip through southern Africa oil started dripping from the engine. Looking underneath the engine I found that the oil is dripping from the clutch housing. It seems that it is engine oil and not gearbox/diff oil. Therefore I assume that the rear engine oil seal is leaking.

2. Looking at the engine repair manual I found that there seem to be two different rear oil seal assembly types. One type is for "engines which have a standard oil seal" and the other one for "engines which have a flywheel housing that is oil filled". > How can I find out which type I have? (I am back in Europe and cannot check visually anymore) Is it maybe part number: DET2418F475?

3. I would need to buy the correct oil seal so that I can fit it the next time I am in South Africa. I would be glad to get input what the correct oil seal number is and where I can buy this oil seal as well as any hints, tips and recommendations regarding the oil seal repair.

Rear transfer case oil seal behind brake drum:

1. There is some oil dripping out of the bottom of the Rockwell transfer case brake drum. I am quite sure that the oil seal needs to be changed there as well. I found quite a bit of info about this seal in the OKA forum but would be glad to know where I can get the correct oil seal.

Thanks for your help !

Paul Nott at east coast Oka can supply both, see in the links section for contact details

I know that Paul Nott is an authority regarding OKA parts.

However, since I am far away from Australia I am depending very much on email communication and/or skype regarding quotation, ordering and paying the parts. I am still looking for a parts dealer who is willing to do that. 

I have asked a relative who is living in Australia if he would be able to receive the parts in the mail. So thats already a bit easier with the shipment.

That's my downside. Having an OKA but not living in Australia. 

I have replaced both seals in the back of the Rockwell transfer case.

The rear drive shaft seal is a National Seal Part Number 471341 & the hand brake drum seal is National Seal Part Number 415483.

You may need to get a new welsch plug for the hand brake drum hub centre however I cheated & drilled a small hole in the plug & screwed a small screw into the plug, forcing the plug out. I then mig welded the small hole, reshaped the plug & refitted it. I have done several thousand Km's since & all is well.

Hope this helps.

Many of the seals are generic and might be available world-wide just as are the bearings.

Have you tried locally in Africa?

Check your rocker cover gasket. Two of mine were leaking oil out of the bellhousing & it turned out to be from the rocker gasket. Also had a couple of Perkins around the farm with same, they start with an oil leak & build a Perkins around it.

Cheers Brett

Google Noordemans Diesel the Perkins agent in Perth, give them your engine number & they will work out which seal it is.

Tony Lee at August 6, 2012 at 6:54 PM

Many of the seals are generic and might be available world-wide just as are the bearings.

Have you tried locally in Africa?

I have not removed the gear box and bell housing to access and check the oil seal. I did not want to end up in a situation where I have the vehicle not working and then finding no spare part.

outyonda.com at August 6, 2012 at 7:48 PM

Check your rocker cover gasket. Two of mine were leaking oil out of the bellhousing & it turned out to be from the rocker gasket. Also had a couple of Perkins around the farm with same, they start with an oil leak & build a Perkins around it.

Cheers Brett

I would have thought that with a leaking rocker cover gasket the oil would run down the side of the engine and not into the bell housing?

Thanks for the hint, I will check once I get to the OKA again.

I thought the rear main was leaking and fitted a new rear main seal when doing the trans swap but the oil is coming out of the rear of the headgasket as well as the pivot pin on the fuel pump.

Rocker cover gasket shows signs of moisture but no actual oil issues forth.

The Perkins Phaser 110 engine is a common engine, used in a number of applications world wide. I would have thought there would be Perkins distributors in Southern Africa. The engine number would give the clue to which variant I would have thought.

I don't know what an 'oil filled' fly wheel is but I'm pretty sure they're not common.

On our LT, #413, there are two seals required when doing the rear main. The first is a paper gasket for the rear Main Seal Cover. DET 36817181 and the Seal Crankshaft Rear DET 2418F475. These numbers are from the LT OKA spare parts catalogue, I assume they are Perkins numbers..

When you're doing the rear main it's a good idea to do the clutch at the same time, especially if it's the original ceramic type. You may also want to replace the plastic slave cylinder with a steel one. Oka Paul is the one to contact regarding these bits.

Dean

This is Wilfried in South Africa.

What is the story with the oil-filled flywheel-housing???

My perkins has 160.000 km on the clock in 17 years. Recently I realized black oil sweating at the bell-housing and removed the tiny 6mm screw from the bottom of the bell-housing to release accumulated oil from the housing - at least i thought so. This idea i copied from the land rover system with the wading-plug. On a long bush-trip i lost oil out of this hole but did not dare to put the screw back not to flood the clutch with oil. 

Is there a seperate chamber that is filled with engine oil? Must the srew be in position? 

My flywheel is dry as well as the clutch seen through the insection whole.

Would appreciate an answer before i remove gearbox and flywheel. Bolts are loose already - so please anybody out there stop me from stripping my faithful OKA for nothing!!!

Kind regards from South Africa. We are living here in Barberton and there is always a visitor with an OKA welcome.

Wilfried,you won't be striping the OKA for nothing,it sounds to me like you have a leak on the rear main seal,it is not the easiest of jobs but there is not other alternative,the clutch is usually clean as the flywheel centrifuges the oil but still makes a mess.

Cheers,Joe

Thanks, Joseph.

But i don't see where the bore leads to, that is blocked by the screw? Does it lead to a cavity that catches oil that seeps through the seal? It is definitely not a drain hole for the bellhousing. Before I removed that screw there was no real oil-leak. 

We are in different time zones, so I only reply now.

Regards Wilfried