rear seal, oil

240 · May 25th, 2011, 12:08

had the rear seal done around 140 miles ago, now have an oil leak ive cleaned the flame trap pipes and nipple but have just noticed today that the rocker cover is again covered in oil even though its had a new seal, would this mean the the rear seal needs attention again?

thanks

morsing · May 25th, 2011, 12:52

Hi,

A rear seal leak would leak out the back of the engine onto the road. Have you have a new valve cover gasket fitted?

240 · May 25th, 2011, 13:01

hi
sorry wasnt very clear......... its leaking from the back and dripping off the bracket underneath and gets worse if the cars been on a long drive, i think its because its more pressure? i took it back to the garage that fitted the rear seal and hes checked the flame trap and pipes etc, and has told me its the rear seal again

morsing · May 25th, 2011, 14:11

Have you done a compression test?

240 · May 25th, 2011, 14:20

Garage say that the engine is fine. They say they did the test maybe i should get another mpinion?

morsing · May 26th, 2011, 07:36

Quote:

Originally Posted by 240

Garage say that the engine is fine. They say they did the test maybe i should get another mpinion?

Get a compression tester from Halfords - not expensive.

Clifford Pope · May 26th, 2011, 08:25

I think we are muddling up different things here.

True, oil can leak out of the crankshaft rear oil seal and drip onto the road.
Oil can also leak out of the rocker cover gasket, down the back of the engine, and onto the road. You need to establish which it is.

If the rocker cover itself is oily then that can't be from either of the two sources above, and must be from a leaking washer on the oil filler cap.

All these will be exacerbated by positive crankcase pressure, which might be because of a blocked breather system, or because of blow-by from worn pistons or bores. hence the suggestion for a compression test.

You can get an idea whether compression is low just by trying to turn it over with a spanner on the crankshaft nut. It should be hard to get it over a compression, and want to spring back again if you release the spanner. If it turns easily with a wheezy hiss, then you have poor compression. But poor compression might be from leaking valves and nothing to do with bore wear.

May 25th, 2011, 12:08	#1
240 BOB MY BIG OLD BUS Last Online: Jan 15th, 2014 01:06 Join Date: Apr 2010 Location: NORTH EAST	rear seal, oil had the rear seal done around 140 miles ago, now have an oil leak ive cleaned the flame trap pipes and nipple but have just noticed today that the rocker cover is again covered in oil even though its had a new seal, would this mean the the rear seal needs attention again? thanks __________________ ~ Never, ever, argue with an idiot. They'll drag you down to their level and beat you with experience ~

May 25th, 2011, 12:52	#2
morsing Premier Member Last Online: Jun 23rd, 2024 08:29 Join Date: Dec 2001 Location: Aylesbury View Photos By: morsing	Hi, A rear seal leak would leak out the back of the engine onto the road. Have you have a new valve cover gasket fitted? __________________ --- '89 Volvo 240GLT B230E/AW70 '14 Volvo V70 SE D4/M66 FWD '70 Chevrolet Chevelle Malibu '95 Saab 9000 CSE 2.0 Turbo Auto

May 25th, 2011, 13:01	#3
240 BOB MY BIG OLD BUS Last Online: Jan 15th, 2014 01:06 Join Date: Apr 2010 Location: NORTH EAST	hi sorry wasnt very clear......... its leaking from the back and dripping off the bracket underneath and gets worse if the cars been on a long drive, i think its because its more pressure? i took it back to the garage that fitted the rear seal and hes checked the flame trap and pipes etc, and has told me its the rear seal again __________________ ~ Never, ever, argue with an idiot. They'll drag you down to their level and beat you with experience ~

May 25th, 2011, 14:11	#4
morsing Premier Member Last Online: Jun 23rd, 2024 08:29 Join Date: Dec 2001 Location: Aylesbury View Photos By: morsing	Have you done a compression test? __________________ --- '89 Volvo 240GLT B230E/AW70 '14 Volvo V70 SE D4/M66 FWD '70 Chevrolet Chevelle Malibu '95 Saab 9000 CSE 2.0 Turbo Auto

May 25th, 2011, 14:20	#5
240 BOB MY BIG OLD BUS Last Online: Jan 15th, 2014 01:06 Join Date: Apr 2010 Location: NORTH EAST	Garage say that the engine is fine. They say they did the test maybe i should get another mpinion? __________________ ~ Never, ever, argue with an idiot. They'll drag you down to their level and beat you with experience ~

May 26th, 2011, 08:25	#7
Clifford Pope Not an expert but ... Last Online: Yesterday 14:30 Join Date: Dec 2001 Location: Boncath	I think we are muddling up different things here. True, oil can leak out of the crankshaft rear oil seal and drip onto the road. Oil can also leak out of the rocker cover gasket, down the back of the engine, and onto the road. You need to establish which it is. If the rocker cover itself is oily then that can't be from either of the two sources above, and must be from a leaking washer on the oil filler cap. All these will be exacerbated by positive crankcase pressure, which might be because of a blocked breather system, or because of blow-by from worn pistons or bores. hence the suggestion for a compression test. You can get an idea whether compression is low just by trying to turn it over with a spanner on the crankshaft nut. It should be hard to get it over a compression, and want to spring back again if you release the spanner. If it turns easily with a wheezy hiss, then you have poor compression. But poor compression might be from leaking valves and nothing to do with bore wear.

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