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Post by james on Oct 24, 2019 3:37:58 GMT
Hi Guys,
I have an Austin 1800 Mk2 (1970) ute engine that is being rebuild due to two pistons melting.. everything is looking good, all clearances are still standard size except the bore which we are doing to +20 thou.... I have had the cam re-ground and almost have all my bearings etc....
I seem to remember someone saying to me once that the harmonic balancer is different on the Austins when compared tot he MBG B service (5 cap main) engine? is that correct? or can I just use any MGB B series balancer?
Thanks heaps.
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Post by dave1800 on Oct 24, 2019 4:27:58 GMT
Hi James
The MGB harmonic balancer is the same but depending on the year you may have to modify the timing notch. As with Landcrabs (Mk11-Mk111)the pointer was changed from the bottom of the timing cover to the top at around 11 o'clock.
From a MGB site advertising a replacement "The Crank Pulley is made using the original MGB design, geometry and materials. Two sets of timing marks, at 28° and 180° relative to the key-slot, accommodate various MGB engine configurations."
Check the rubber is not swollen or distorted or you may find the mark has shifted a few degrees.
I assume you have found the cause of the original pistons melting, that is quite unusual in my experience with these engines.
David
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Post by james on Oct 24, 2019 23:10:09 GMT
Thanks very much for the reply, yes the rings were very worn which allows oil/carbon to built up in between the rings... my engine builder said that this build-up actually heats up more than the surrounding area which caused the lip between the top ring at the top of the piston to melt/blow out... they look like two little volcanoes on the side of each piston... it was a very worn engine, still original from factory... when we took it apart we measures all the bearings etc and they were all standard size. there was some wear on the crank bearings and the "followers" had worn through... hanging around people who build engines has me to calling lifters followers now  Luckily I had reversed the car up our drive and into the garage before turning off the engine... once it was off it would not start again... I am looking at getting one of these www.norndaautomotive.com.au/romac/find-parts/romacproducts.html?make=BMC&model=British%20.&series=MGA:MGB%20B%20SeriesThey have an all steel version and a steel inner with aluminium outer but that one is much more expensive.... On the same site they sell double row timing chains, I am assuming that these will also be okay for my 1800? Thanks |
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Post by Penguin45 on Oct 24, 2019 23:27:55 GMT
Hi James.
MkII was definitely the duplex timing chain set up. Cheap and sensible to replace it whilst it's apart. Don't forget the oil seal in the chain cover whilst you're in there. It'll probably still leak, just not as much!
Sorry, getting a bit cynical in my old age.
Chris.
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Post by james on Oct 24, 2019 23:56:01 GMT
www.bonhams.com/auctions/16246/lot/509/What is the purpose of the Handles on the rally car guards? Also, why have the ducted cold air from the bonnet scoop area to just behind the alternator? oh an where did they put the "Second radiator" in these things? it must be just in front of the alternator i think? also also, where is the brake booster?  Talking about oil leaks, my sedan has a steady stream of auto fluid leaking from the gear change cable thingy on gearbox end.. I have tried changing the little O ring so many times but after a few weeks it just starts pouring out again... it has the later model gearbox in it... the one with one gear-change cable instead of two... Also lastly (to do with my ute)... does anyone have any leads on the bits required to rebuild an automatic gearbox please? It is the standard two gear change cable type... Thanks
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