Museum Se5a - Revival!

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Re: Museum Se5a - Revival!

Post by scimjim » Mon Jan 21, 2013 8:57 pm

Couldn't pull he skin off the proverbial pudding if those figures were accurate. You're looking for 140+


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Re: Museum Se5a - Revival!

Post by jwdg298 » Mon Jan 21, 2013 8:58 pm

scimjim wrote:Couldn't pull he skin off the proverbial pudding if those figures were accurate. You're looking for 140+
Oh, reckon I need a better tester then (or start worrying?) :oops:



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Re: Museum Se5a - Revival!

Post by tony.idle » Mon Jan 21, 2013 11:54 pm

Oakesy wrote:The results aren't REALLY terrible, so its hopefully not something too bad. Try the headgasket first and see what it does. The heads are easy to get off on an Essex, not like these Japanese things :roll: :wink:
Josh

You're wrong - they're absolutely terrible. They'd only be marginally worse without pistons :mrgreen: :mrgreen: :mrgreen:


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Re: Museum Se5a - Revival!

Post by Oaksey » Mon Jan 21, 2013 11:59 pm

I'm comparing to my old Ti engine that had nothing. This engine could be low due to more than one reason. After doing the valve stem oil seals on my 5a, it made a differance and if this test wasn't done when the engine was hot and without the throttle open, paired with an inaccurate compression tester, the actual figures may not be that bad. Not saying I'm right, just trying to sound optimistic (for a change :wink: )


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Re: Usable 5 or 5a wanted

Post by tony.idle » Tue Jan 22, 2013 12:00 am

tony.idle wrote:If you haven't done a compression test before ................... you need the throttles fully open, choke off, and if possible, engine at operating temperature.


As I mentioned earlier ................... :D :D


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Re: Museum Se5a - Revival!

Post by jwdg298 » Tue Jan 22, 2013 3:00 pm

Thanks Tony, i'm trying to source/borrow a better tester then i'll retry the compression tests. I can get her running so I will also let her get good and warm first :oops: then report back. I want the snow to bu99er off now though.



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Re: Museum Se5a - Revival!

Post by jwdg298 » Sat Jan 26, 2013 6:44 pm

Hi all,

Well I did the compression test again with my new tester (Sykes pickavant, much better bit of kit :D ) and the results are as follows:

1,2,3,4 and 6 all just shy of 150psi but 5 was only registering a maximum of 50psi. :cry:
I did the test on 5 at least 3 times just to make sure. I also noticed that there was oil on the engine bay wall by the wiper motor after the compression tests, in the area that 5 would eject from? I don't know if this is significant?

So my question to you guru's out there is where do I go from here? I have read on the net that I should do the comp. test again with a dribble of oil down the plug hole? what would this tell me? I have also read on here somewhere that air down the plug hole will identify the issue further.

Do I need to do this or just get the head(s?) off?

I eagerly await your advice, thanks in advance.

PS, Phil engine was at 90ish on the gauge, all plugs out, choke off and throttle fully applied this time :wink:



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Re: Museum Se5a - Revival!

Post by Oaksey » Sat Jan 26, 2013 6:49 pm

could be a piston ring is worn maybe? Possibly bore damage


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Re: Museum Se5a - Revival!

Post by Corky » Sat Jan 26, 2013 7:10 pm

If you drop oil in and the readings increase significantly, then it's likely to be a ring or piston etc. if it makes no difference then it's most likely a valve or HG. Whatever happens the head will need to come off. Some people will tell you just to take the offending head off, but I would say its good practice to do both.


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Re: Museum Se5a - Revival!

Post by jwdg298 » Sat Jan 26, 2013 7:47 pm

scimitarcars.org.uk wrote:If you drop oil in and the readings increase significantly, then it's likely to be a ring or piston etc. if it makes no difference then it's most likely a valve or HG. Whatever happens the head will need to come off. Some people will tell you just to take the offending head off, but I would say its good practice to do both.
Thanks for this info, I will do the test again tomorrow and post the results. It feels more like a lack of project progress thread at the moment, Oh well...... :cry:



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Re: Museum Se5a - Revival!

Post by scimjim » Sat Jan 26, 2013 7:54 pm

I wouldn't bother with an oil test with that reading - get the head off and it'll be obvious IMHO.


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Re: Museum Se5a - Revival!

Post by jwdg298 » Sat Jan 26, 2013 8:02 pm

Ok Jim thanks. Without the oil test what damage should I be expecting to see? Will it be obvious even to the uneducated like me? I guess I need to look at HG , Cylinder bore, valves, plus give the head a good look over for cracks? I will probably do the test with oil just for the experience unless you think it's entirely pointless?

Cheers
Gerry



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Re: Museum Se5a - Revival!

Post by scimjim » Sat Jan 26, 2013 8:07 pm

Not pointless for the experience but being that low you will have obvious damage, not just a small leak somewhere. If the water system isn't pressurising and the adjacent cylinders are stable, I'd discount the HG? Check bores for scoring (broken rings), valves for burning, chips missing, etc and head for cracks (usually between valves or valve and plug hole).


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SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
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Re: Museum Se5a - Revival!

Post by AndyD » Sat Jan 26, 2013 9:36 pm

Just a thought- sorry if I have missed something in the thread.

Are the valves definately closing on that cylinder?? If it were me (which it aint!), I'd just want to be sure before taking the heads off. Easy enough to check for gap between rocker and pushrod end on a cold engine... (or check/ set them properly to be super-thorough... Before stripping :lol: :( )

And if it makes you feel any better Gerry, I bought a cracking 6B the day before my wedding from a very nice chap in Macclesfield... 8) I had arranged to pick up the blushing bride to be in Liverpool, then raz up to Glasgow to get married. Except I burst a coolant hose on the M6 after about 30 miles.

And cooked an otherwise fine motor! That was an interesting phone call to my wife to be, and a predictable best man's speech/

Welcome to Scimitar ownership, eh?? I hadn't done (car) heads before, and no V-engine experience but slowly slowly catchey monkey. Good gaskets from JW (twice! :oops: ), and it did show up a rad that wanted re-coring, an athersclerotic cooling system that wanted all hoses replacing (for my pedantic satisfaction, they may have been fine) and it gave me initial familiarity and subsequently a car that I was confident in. I know how you feel, but its not the end of the world. And the car was the best thing I had ever purchased!

Lots of help on here, keep your head up!

a



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Re: Museum Se5a - Revival!

Post by scimjim » Sat Jan 26, 2013 9:55 pm

good point Andy, but given that it ran fine for so long, it's unlikely that the valve clearances reduced on their own (barring catastrophic seat recession)?


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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