Topic: I need help ;-) (Read 3836 times)

gtomo2 · « **on:** August 30, 2006, 11:06:55 »

My replacement head arrived yesturday and i have never changed one before. its the left bank as you look at the engine (n/s). so not a lot of stuff in the way. So if anybody not doing much over the weekend and fancys giving me a hand plaese. as i dont know what i am doing.. Its on a disco 1991 3.5 efi. i am on the road til friday so anybody wanting to help me give me ring on 07894 691369. Thanks. Oh will provide tea/coffee and chocloate bickys (may even push for jaffa cakes)

Rangie3.0LtrDan · « **Reply #1 on:** August 30, 2006, 14:21:21 »

What he meant to say was its the left bank as you look at the engine from the grille and that means the offside one, or otherwise known as drivers side ;) lol

AbyssDJ · « **Reply #2 on:** August 30, 2006, 14:50:33 »

i'd help you as im only around the corner (as you know!) but i dont have a clue either :D

Porny · « **Reply #3 on:** August 30, 2006, 15:40:41 »

I'd help, but I'm a bit busy this weekend.... and I don't know if I can put up the misses moaning again

Ian

mud-club-matty · « **Reply #4 on:** August 30, 2006, 20:57:15 »

im only around the corner and i see heads changed and it dont look to hard but i bet it is

Range Rover Blues · « **Reply #5 on:** August 31, 2006, 16:15:15 »

If only I wasn't up to my kneck I'd say bring it over. It;s not too hard but make sure you follow the torquing up procedure. Use a good quality thread lock/lubricant on the bolts (not copper grease as soem numpty did on mine :shock: ). Don't mix up any pushrods, stick them through a bit of cardboard to keep them in order.

Use the composite gasket if you want reliability, it will lower compression though so is it a new or a recon head? you can check how much has been skimmed, on the front of that head is a square luh with a hole in the end, if it's close to the gasket surface than the outside edge it's been skimed by the difference in the 2 apparently. You want fairly even copmression on both sides of the engine.

you should change the valley gasket too.

Can't think of owt else but if you get truly in the [PooPoo] I'm not too far away, just busy as a badger for the next 2 weeks.

drmike · « **Reply #6 on:** September 01, 2006, 13:32:05 »

I've done this job and it's not that bad if you take it steady and follow the manual - I'm no engineering genius that's for sure!

Be aware that some valley gaskets have a right and a wrong way round - get it wrong and it's water in the ol time. I'd use a composite valley gasket as well as composite head gasket.

Totally agree about keeping pushrods in cardboard to make sure they go back as they came out.

I managed to shear a rocker arm bolt but it drifted out easily enough. That was plain stupidity on my part because I was tired!

I'm sure you'll be fine. Everyone had to do this sort of job for the first time once!

Mike

gtomo2 · « **Reply #7 on:** September 01, 2006, 16:53:21 »

Thanks for the adivce i will take it in and got a full gasket set so will change the vally one as well. just need to buy a book on in now and pray the weather holds. its a second hand head dont think its been skimmed as it looks dirty around the cyl head valve area.

karlo · « **Reply #8 on:** September 01, 2006, 17:29:50 »

Graeme i can sort you that disc its got all that info on it!

drmike · « **Reply #9 on:** September 01, 2006, 17:41:10 »

If the head is second hand are you sure it's flat? I had my heads skimmed when I did this job as I didn't want to be doing it again in 2 months! Cost me 20 quid a head I think.

You can download the workshop manual for a V8 from a Polish site. Just google Land rover workshop manual V8 - it should work.

Mike

gtomo2 · « **Reply #10 on:** September 01, 2006, 18:27:32 »

Quote from: "karlo"

Graeme i can sort you that disc its got all that info on it!

Thanks mate i may just need that yes please

karlo · « **Reply #11 on:** September 01, 2006, 20:21:07 »

Ok mate pm me your address and you shall have it

gtomo2 · « **Reply #12 on:** September 02, 2006, 20:06:02 »

Had a good look at the head today with matty and his dad (and a big thanks for the use of the garage). and thought better of it will have to do the job correctly so will have to get the head skimmed first. so we fitted the new springs instead and after shearing a few bolts off and having to redo so mounts and ditch the rear anti roll bar its starting to look good (just still sounds like a tank :roll: ) But at least i did it in the dry and not outside. Only thing that went wrong i forgot to tighten the n/s/r wheel nuts back up and wondered what the knocking nosie was coming from the back thought oh great thats the propshaft gone. but no only loose nuts (story of my life

) so one quck nut tighten later and she is ok 8) .

mud-club-matty · « **Reply #13 on:** September 02, 2006, 20:08:42 »

no problam mate if you need to know where the bloke is to skim the head let me know e can tell you were he is

mud-club-matty · « **Reply #14 on:** September 02, 2006, 20:17:14 »

discos

Porny · « **Reply #15 on:** September 02, 2006, 20:22:04 »

Why are you changing the head???

mud-club-matty · « **Reply #16 on:** September 02, 2006, 20:23:54 »

the studs have broke and no fread in them

Porny · « **Reply #17 on:** September 02, 2006, 20:25:56 »

Studs have broke... how much of the broken stud is still protruding from the head?? I.e. have they snapped flush with the head, or are they still protruding slightly?? If so how far, more or less than the exhuast manifold??

Ian

mud-club-matty · « **Reply #18 on:** September 02, 2006, 20:27:40 »

well what i can see the back ones have come out and there is no fread in some of them but the overs not got a clue

gtomo2 · « **Reply #19 on:** September 02, 2006, 20:31:51 »

there are four studs missing two have stripped out the thread one is snapped half way inside the head and one is snappedd flush with the head.
But i dont have the kit to drill them out and re thread them plus got a new seconed hand head with the car.

Porny · « **Reply #20 on:** September 02, 2006, 20:36:52 »

Quote from: "gtomo2"

there are four studs missing two have stripped out the thread one is snapped half way inside the head and one is snappedd flush with the head.
But i dont have the kit to drill them out and re thread them plus got a new seconed hand head with the car.

Shame the two have snapped inside the head....

The striped ones could be re-drilled and helicoiled very easily, but the snapped two would be slightly harder.

If they'd snapped protruding from the head, then you can usually get them out by welding a bolt to the broken section... the heat of the welding usually helps them out.

You could probably drill the two snapped ones quite easily... would usually be easier than removing the head. The problem though is access... you need to make sure you drill straight - which is a bit awkward with the head still on the engine/in the car... at least if you want to make sure you do it properly.

Ian

mud-club-matty · « **Reply #21 on:** September 02, 2006, 20:38:35 »

ian you prob got all the kit o do in though lol

gtomo2 · « **Reply #22 on:** September 02, 2006, 20:43:55 »

Quote from: "Porny"

Shame the two have snapped inside the head....

The striped ones could be re-drilled and helicoiled very easily, but the snapped two would be slightly harder.

If they'd snapped protruding from the head, then you can usually get them out by welding a bolt to the broken section... the heat of the welding usually helps them out.

You could probably drill the two snapped ones quite easily... would usually be easier than removing the head. The problem though is access... you need to make sure you drill straight - which is a bit awkward with the head still on the engine/in the car... at least if you want to make sure you do it properly.

Ian

They are on the easy toget at side of the engine. but just never done it before plus not having the kit. plus like you say dam hard to drill stright when the head is at a angle. and alloy is so easy to drill through which would be my luck
:roll:

mud-club-matty · « **Reply #23 on:** September 02, 2006, 20:45:30 »

and ou have bought the gasket set

Porny · « **Reply #24 on:** September 02, 2006, 20:56:57 »

Quote from: "gtomo2"

and thought better of it will have to do the job correctly so will have to get the head skimmed first

Sort of....

But do you know if the other head (the one your leaving on) has every been skimmed?? You could end up with a different compression ratio on each head, which isn't the best.

Or, has the new head you've got ever been skimmed?? Again, you could end up with the same problem, but in reverse.

IMHO, all I'd do is check the new head is flat - which you can do yourself with a flat edge and go from there. (as long as the face is in good condition)

If you want to do it properly, you need to take both current heads off and measure the piston/cylinder volumes, and then measure the volumes of all 3 of the heads... and calculate the Compression Ratio.

Ian

mud-club-matty · « **Reply #25 on:** September 02, 2006, 20:58:18 »

this sounds like a garage job lol :D

Porny · « **Reply #26 on:** September 02, 2006, 21:41:57 »

Quote from: "mud-club-matty"

this sounds like a garage job lol :D

Wasn't it a garage that advised just to have the one head skimmed??

:roll:

Ian

gtomo2 · « **Reply #27 on:** September 02, 2006, 21:50:22 »

Quote from: "Porny"

Quote from: "mud-club-matty"
this sounds like a garage job lol :D

Wasn't it a garage that advised just to have the one head skimmed?? :roll:

Ian

Yes but he did point out to me the down fall of just getting the one head done and not knowin if the original head's had been skimmed before. or if the replacment had been skimmed as we had a good luck at ti but coukd not see if it had been skimmed before

Porny · « **Reply #28 on:** September 02, 2006, 21:57:04 »

Quote from: "gtomo2"

Yes but he did point out to me the down fall of just getting the one head done and not knowin if the original head's had been skimmed before. or if the replacment had been skimmed as we had a good luck at ti but coukd not see if it had been skimmed before

Sorry was just having a (joking) dig at Matt

...

I really wouldn't bother gettting the head skimmed, all I do is check it's flat, and then just presume that it's never been skimmed, and that the one on the engine at the moment is original - and hasn't been skimmed.

And just bolt it all togther.....

Or you could take some volume measurements..... but depends what your after.

Ian

mud-club-matty · « **Reply #29 on:** September 02, 2006, 22:21:15 »

ian got that td5 built yet :D it will be fine

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AuthorTopic: I need help ;-) (Read 3836 times)

AbyssDJ