Engine Rebuild Novice

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IanC
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Engine Rebuild Novice

Post by IanC » Mon Apr 22, 2019 8:01 pm

Thanks chaps, I hadn't heard of RTV up till now. Anyway, I used Wellseal letting it rest for the suggested 5 mins before sticking the gasket to the machined face and then fitting the sump with more sealant on the mating face. I've a few jobs to do before I fit the engine, then it'll be fingers crossed that it holds oil. If not, then I'll try the RTV route.
Ian


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Engine Rebuild Novice

Post by Old and Slow » Tue Apr 23, 2019 1:54 pm

Forgot to say,
Don't put too much RTV on the joints - it could squeeze into the engine and end up being circulated with the oil, with potential devastating consequences.
Good luck with the rebuild.


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Engine Rebuild Novice

Post by IanC » Wed May 01, 2019 2:02 pm

Flex plate issue - maybe. When trying to install the engine today I noticed that the balance weight on the flex plate was brushing the rearmost lip of the sump. I took the engine out again and saw that when I turned the crank over the flex plate seems to well, flex in that there's a heck of a runout (photos). I'm concerned that if I bolt it to the T/C it'll be causing it to shoogle as it won't be square on.
I see from the invoices that came with the car that the starter ring is new, and I wonder of the spot welding of it to the plate has caused it to distort.
Anyway, am I worrying needlessly, or does the plate need replacing? And if so, how do I get the plate in balance? I see that there's a yellow paint mark on the flex plate spacer (and it seemingly can only match up all six bolts holes on the crank one way) which matches a mark on the flex plate, hopefully if I transfer that mark relative to the balance weight on a replacement plate if needed, it'll be OK.
Guidance gratefully received!
Ian
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Big gap
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IMG_20190501_133202.jpg
Wee gap
IMG_20190501_133202.jpg (121.48 KiB) Viewed 1099 times


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Engine Rebuild Novice

Post by Coupe Racing » Wed May 01, 2019 2:12 pm

Silly question
Is the plate back to front ?


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Engine Rebuild Novice

Post by IanC » Wed May 01, 2019 2:28 pm

Not a silly question at all, it was the first thing that came to mind when I saw the balance weight fouling the sump. However on the plate (as fitted) where it attaches to the T/C there are oblong marks matching the mounts on the T/C and on the 'engine' side there are round marks where the bolt head touches, so I'm sure it's the right way round.
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Engine Rebuild Novice

Post by Roger Pennington » Wed May 01, 2019 2:59 pm

I wonder just how critical the balance of the flex-plate actually is, bearing in mind that it's only a fairly thin flimsy thing, much thinner than a "proper" flywheel?


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Engine Rebuild Novice

Post by IanC » Wed May 01, 2019 3:49 pm

Roger Pennington wrote:
Wed May 01, 2019 2:59 pm
I wonder just how critical the balance of the flex-plate actually is, bearing in mind that it's only a fairly thin flimsy thing, much thinner than a "proper" flywheel?
and being so thin, maybe bolting it to what appears to be a fairly rugged torque converter, would tend to put it back in shape... wishful thinking perhaps!


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Post by scimjim » Wed May 01, 2019 5:01 pm

IanC wrote:
Wed May 01, 2019 3:49 pm
Roger Pennington wrote:
Wed May 01, 2019 2:59 pm
I wonder just how critical the balance of the flex-plate actually is, bearing in mind that it's only a fairly thin flimsy thing, much thinner than a "proper" flywheel?
and being so thin, maybe bolting it to what appears to be a fairly rugged torque converter, would tend to put it back in shape... wishful thinking perhaps!
I think you’re right - the TC will pull it back into shape when it’s bolted up. Was the engine removed with the TC attached? It looks like it’s bent which can happen when that’s done - if so, check for cracks.


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Engine Rebuild Novice

Post by IanC » Wed May 01, 2019 5:59 pm

Thanks, I'll check for cracks as you suggest. I don't however know how the engine was removed, but the T/C was already separated from the gearbox when I got the car.
I might just try re fitting the engine with the flex plate as is, after maybe giving it some 'encouragement' to make it as flat/true as possible.


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Post by IanC » Fri May 03, 2019 6:17 pm

A mystery solved. After many attempts I've got the engine back in, the last hold up was caused by the engine to bell housing gap remaining at about 5mm and tightening the bolts wouldn't close it up. I thought unsurprisingly that I'd fitted something wrong. However, the previous owner had bought a very nice (and somewhat pricey) full engine set of SS bolts, and I had a think about the sump issues I had - these included half the bolts being too long. Could it be the same issue with the B/H? indeed it could, the bolts were again too long and bottoming out. The old ones were re-used and voila, engine back in place. Another milestone passed!


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Post by TrevorG » Fri May 03, 2019 7:31 pm

Unless the original bolts were also stainless, you may want to grind each of the new bolts down to the length of the old ones and use them!



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Post by IanC » Fri May 03, 2019 8:11 pm

Hi, thanks for the suggestion, but yes i did think of that, but only after I'd fitted the old ones!


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Post by TrevorG » Sat May 04, 2019 12:53 am

Yeah, happens to me all the time.....hindsight is a wondrous thing....not!



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Post by IanC » Sat May 04, 2019 3:37 pm

Damn, you've sown the seed now :roll: I see the two bottom bolts will fit as the tapping goes right through the block casting and out to daylight so I don't need to shorten two of the SS ones, but I'll do the others. Might as well do it right!


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Post by IanC » Sun May 05, 2019 1:51 pm

Spoke to soon, I knew I was tempting fate when I said that I'd passed a milestone when I'd got the engine in! One of the flex plate to torque converter bolts is fouling an engine back plate bolt. This is something I checked and double checked before fitting the engine, but I realise now I must have picked the 'highest' point of a bent flex plate to do my checking, so the problem didn't show up. It also means it's not really going to be practical to try to flatten out the plate by bolting it to the T/C. I'll have another go at trying to true the flex plate off the engine, but ultimately I think I'll be on the lookout for a replacement F/P.

Edit, just found a crack in the plate (as predicted by scimjim) so I'm off to the 'wanted' section now!


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