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Discussion Starter #1
I have started pulling my engine apart to change it's cam and when i removed the rocker covers this is the sight that greeted me:




everything is covered in emulsified oil. does this indicate a serious problem or that a previous owner skipped some oil changes?
Is there anything i can do to clean some of the crud off other than scraping it away with a screwdriver?
Cheers.
 

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TG.

Have you also got a pic of the inside to the engine sump ? This might give a better view of the health to your Rover V8 donk as well as an ugly top end image !

Cheerio,


Vinniman
'88 Highline
Perth, W.A.
 

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Hi Vinni,
I haven't taken the bottom end apart yet (the bloody crank pulley bolt won't come undone) I'll get to that over the weekend and post a pic when i have it dropped.
Cheers,
Terry.
 

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I would say that the motor would not be in good condition due to poor servicing and probably excessive blowback.

You can really clean it up that much without risking getting it right through the motor. Also if it is that bad in the areas that you can see, it is probably not good in the areas that you can't
 

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I'm expecting it to be pretty gunked up inside. It is VERY down on compression but a wet / dry compression test only shows an improvement of 10/12psi per cylinder with oil in the bores so i'm hoping they are OK and a new cam will liven it up a bit (It's about 90psi all round). It's a late 4.2 so it's got 10 stud heads, composite gaskets, etc. Fingers crossed removing as much of this crud by hand as i can and a good flush through will do it some good. Otherwise it will have to be layed up for a while until I can find 2.5k for a rebuilt engine :?
 

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Thats nasty, looking through the oil filler cap mine is similar, but not as bad, but maybe removing the rockers will reveal how bad mine is :(


May I ask how many miles and how many owners?
 

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It's just turned over to 150,000 miles. I'm Owner number 6, the owner before me had it for a year and did no miles at all but let it idle for half an hour on his driveway every week which has probably done it no favours at all!
 

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TG.

I was worried when you came up with the compression numbers, even though they're fairly similar the thought of cleaning the beast would make it even worse ?
If you would need to face the music with the inevitable case of ditching the motor, might I suggest the Audi V8 equivalent which is much cheaper and bolts up !

I checked out Ebay UK and their source of used Audi parts and spares is pretty extensive, just making sure you've looked at all options before cam-in-heading.
You'd really have to ask yourself for how long you're likely to keep this LSE going as I've heard evidence through our grapevine that 4.2 V8 Rover's are weak links.

Cheerio,


Vinniman
'88 Highline
Perth, W.A.[attachment=0:nkjg7bcw]AV8parts.jpg[/attachment:nkjg7bcw]
 

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Taken from http://www.v8engines.com/engine-4.htm#inside (Rover V8 specialists)

A good look inside the rocker covers through the oil hole will help you to determine the internal condition (and the minimum parts you will need for a successful job).
if your are unsure, it will fall into one of the following categories.

Silver Alloy surfaces? Sounds like a new engine
Brown tarnished? Very low mileage, dark brown? Perhaps higher mileage, but well cared for.
Black? Getting poor, a full rebuild/replacement should be considered.
Black Coated & becoming dense? Very poor condition, A rebuild is normally required
Black and very sludgy? Dead on its feet.


You can be sure this method is a reliable way to determine what you have, and to help you decide what you should do.


Maybe it's worth leaving the old cam in and saving towards a rebuild? Either way, good luck!
 

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The 4.2 is a very good motor. People who think they can get more than 3,000mi out of a oil change, use cheap low grade oil filters, and use just water in the coolant system think its a bad motor. Because it dosnt like abuse dosnt make it a bad motor. 4.2's with propper care last just as long as other Rover V8s. Just take a peak at my 250,000mi 4.2
 

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If you're not getting improved compression with oil in the bores then you have badly seated valves and/or leaking valve stem oil seals. A new cam will not make one jot of difference to this - you'll get improved opening on the valves, but your problem is when they're supposed to be shut.

Either take the heads off and reseat the valves and replace the oil seals, or don't waste the time and money on the new cam.
 

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PS, Leo:

I don't give a **** about soccer but I'm really excited about drinking at 7 in the morning

Nice! :lol:
 

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Just been doing a top end rebuild on mine after coolant pressurisation problems, and they were as bad if not worse than yours. Similar mileage too, both head gaskets were badly past it (read completely sh****d) and the valley was disgustingly gunged up. Surprisingly, underneath all the c**p, the components were remarkably good. I had the heads, manifold plenum and rams all acid dipped (only £20 at a local engine rebuilder) and that got just about all of it off.

The rocker covers were disgusting, I scraped the worst of it off then used a pan brush and Gunk to clean the rest.

Same treatment for the valley, rocker shafts, valves, push rods and also cleaned out all the cam followers. I found that the ideal thing for cleaning the face of the heads and block (and other components) are those green plastic pan scourers, course enough to get the carbon, oil residue and laquer off but not course enough to damage the surface. Once clean, the valves didn't even need lapping in, new valve stem seals fitted.

Just putting it all back together . . .

Alastair
 
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