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Post by justyfied on Feb 2, 2014 10:54:11 GMT -4
Gave the cylinders a quick hone out today & they have come up pretty good, looks like I could use standard pistons & rings if I want   . Gave the head gasket surface a quick clean & ran the straight edge over it to check for warpage & it looks pretty good in that department. So now I need to get the head crack tested & checked for hardness, I did a quick hardness test myself & it seems okay, but I would like to get it confirmed. No news from New Zealand yet about Justy pistons, might have to send them a reminder.  All good news, I kind of figured that your cylinders would be fine, all the Justy engines I have taken apart show negligible wear too! I think Subaru uses pretty hard iron when they make those blocks. Give me a couple of days and I will contact an importer of Japanese parts I know, Maybe I can order the 2 pistons you need and have them shipped to you. Warning, they are going to cost over $100.00 each I think.  |
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Post by lincolntbird on Feb 2, 2014 11:08:58 GMT -4
Gave the cylinders a quick hone out today & they have come up pretty good, looks like I could use standard pistons & rings if I want . Gave the head gasket surface a quick clean & ran the straight edge over it to check for warpage & it looks pretty good in that department. So now I need to get the head crack tested & checked for hardness, I did a quick hardness test myself & it seems okay, but I would like to get it confirmed. No news from New Zealand yet about Justy pistons, might have to send them a reminder. All good news, I kind of figured that your cylinders would be fine, all the Justy engines I have taken apart show negligible wear too! I think Subaru uses pretty hard iron when they make those blocks. Give me a couple of days and I will contact an importer of Japanese parts I know, Maybe I can order the 2 pistons you need and have them shipped to you. Warning, they are going to cost over $100.00 each I think. |
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Post by justyfied on Feb 4, 2014 11:51:51 GMT -4
So, the Parts Importer has been given the info and will reply later today or tomorrow, I will let you know when I know.
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Post by lincolntbird on Feb 11, 2014 11:54:51 GMT -4
As you may have read here I am in the process of rebuilding my Sherpa EK42 engine. I will be running standard pistons as the bore is good, but I need to replace the pistons as they are marked up on the thrust side. The problem is these pistons are no longer available, so it has been a case of trying to find something to fit. Several options where tried, including the local machine shop & JP Pistons without any luck. Justyfied has been very helpfull here & has found that apart from the valve reliefs the Justy EF10 pistons are the same, so with a small amount of machine work they should do the job. The problem is the Justy was not sold in Australia so the parts are not available locally. I have found some through a New Zealand Subaru dealer & justyfied has also been able to locate some for me. I have been able to locate standard rings through a couple of sources, who can also supply gaskets & bearings; they are Precision International with Hastings rings. www.precisionintl.com/Default.aspx & RockAuto. RockAuto have Goetze rings, part number 089603, they list these as suiting these Subarus, Justy '84-'89, Libero '83-'87, Mini Jumbo '82-'89, Rex '82-'89, Sherpa '82-'89, Sumo '83-'87 & Vanille '83-'87. The other main parts I need to sort out oneway or the other now is the balance shaft chain & the water pump. There are one or two other piston options but they require some machine work & may have to wait for another time. |
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Post by justyfied on Feb 11, 2014 12:18:15 GMT -4
Lincolntbird,
Great bit of info there, Not too surprising that the Sumo which used a EF12 variant would share the same rings as that all of the 700 series cars that are the rex, Sherpa's etc.
Wondering what JP pistons told you? What was the price for custom "Forged" pistons and how long would it take?
The OEM Cast pistons look to be very simular to the kind seen in many Japanese motorcyles from the 70's and 80's.
I suspect that Subaru has contracted the piston production out.
This is a win for us as we all know that motorcycles typically see a much higher rev limit than car engines do,
and thus should be more than adequaite for our use's.
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Post by lincolntbird on Feb 11, 2014 12:37:07 GMT -4
JP Pistons just said that they could not help me with my enquiry.
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Post by justyfied on Feb 11, 2014 12:48:31 GMT -4
JP Pistons just said that they could not help me with my enquiry. Sorry to hear that, They probably don't see that with the thousands of people on this forum alone that would want pistons, (SIC) they would have enough demand to make it worth while eh?  So back to the plan of using OEM EF10 Flat top pistons and modify the one valve relief. I will update you on the progress on that once they are ordered. |
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Post by lincolntbird on Mar 27, 2014 9:16:08 GMT -4
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Post by lincolntbird on Apr 14, 2014 12:21:56 GMT -4
A quick update on my EK42 engine rebuild, have got the head back from the machine shop, it checked out okay & has had a surface grind. Have also been able to source a chain that will be suitable for the balance shaft chain with the help of the machine shop. When I find out the details of the chain I will post them here for future reference. Have also ordered water pump, oil pump outer rotor, rocker cover & sump gaskets, rear main seal front cover crank case gasket genuine from my local Subaru dealer. The spare parts people are very helpful there. Have yet to order rings, bearings & remainder of gaskets & seals, they will be aftermarket. Cheers....lincolntbird. P.S. Just bought a set of Honda V65 pistons & rods to do an experimental EK42 engine rebuild with, this build may take a little while as there are a few things I would like to do, so updates may be well spread out  . |
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Post by justyfied on Apr 14, 2014 14:42:49 GMT -4
Oil Pump rotors, gaskets, seals all kinds of goodies. Great to hear that you were able to purchase that all from the dealer. sure beats cutting out gaskets from a cereal box!
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Post by lincolntbird on Apr 26, 2014 7:41:17 GMT -4
Here is that promised information on the balance shaft chain for the EK42, for those who may need one one day. The chain I found is from the Mitsubishi 4G54 engine, part number 8MMSR-90. It is the balance shaft chain for the 4G54, it is longer than the EK42 chain so will need to be shortened accordingly. The new chain comes with a master joining link, so that makes the job much easier, just remember to put the clip on the right way. The only thing that will have to be done is line the old chain up with the new chain & mark the positions of the 3 bright links for the balance shaft timing. Still waiting on the parts to arrive from Subaru. Also waiting on a set of pistons & rods from a Honda VF 1100 to arrive, for a performance engine build . |
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Post by justyfied on Apr 26, 2014 9:07:06 GMT -4
Here is that promised information on the balance shaft chain for the EK42, for those who may need one one day. The chain I found is from the Mitsubishi 4G54 engine, part number 8MMSR-90. It is the balance shaft chain for the 4G54, it is longer than the EK42 chain so will need to be shortened accordingly. The new chain comes with a master joining link, so that makes the job much easier, just remember to put the clip on the right way. The only thing that will have to be done is line the old chain up with the new chain & mark the positions of the 3 bright links for the balance shaft timing. Still waiting on the parts to arrive from Subaru. Also waiting on a set of pistons & rods from a Honda VF 1100 to arrive, for a performance engine build . Hey, great tip, how did you come across the info on that chain? Did you google the chain pitch or have you had your hands on one of the Mitzu engines? Now you got me interested in checking to see if that is the same chain for the Justy engine. Might come in handy being able to shorten the chain if I want to go to an electric water pump and no balance shaft. |
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Post by lincolntbird on Apr 26, 2014 12:40:03 GMT -4
Here is that promised information on the balance shaft chain for the EK42, for those who may need one one day. The chain I found is from the Mitsubishi 4G54 engine, part number 8MMSR-90. It is the balance shaft chain for the 4G54, it is longer than the EK42 chain so will need to be shortened accordingly. The new chain comes with a master joining link, so that makes the job much easier, just remember to put the clip on the right way. The only thing that will have to be done is line the old chain up with the new chain & mark the positions of the 3 bright links for the balance shaft timing. Still waiting on the parts to arrive from Subaru. Also waiting on a set of pistons & rods from a Honda VF 1100 to arrive, for a performance engine build . Hey, great tip, how did you come across the info on that chain? Did you google the chain pitch or have you had your hands on one of the Mitzu engines? Now you got me interested in checking to see if that is the same chain for the Justy engine. Might come in handy being able to shorten the chain if I want to go to an electric water pump and no balance shaft. |
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Post by lincolntbird on Apr 29, 2014 11:14:26 GMT -4
A quick update on my EK42 engine rebuild, have got the head back from the machine shop, it checked out okay & has had a surface grind. Have also been able to source a chain that will be suitable for the balance shaft chain with the help of the machine shop. When I find out the details of the chain I will post them here for future reference. Have also ordered water pump, oil pump outer rotor, rocker cover & sump gaskets, rear main seal front cover crank case gasket genuine from my local Subaru dealer. The spare parts people are very helpful there. Have yet to order rings, bearings & remainder of gaskets & seals, they will be aftermarket. Cheers....lincolntbird. P.S. Just bought a set of Honda V65 pistons & rods to do an experimental EK42 engine rebuild with, this build may take a little while as there are a few things I would like to do, so updates may be well spread out . |
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Post by justyfied on Apr 29, 2014 17:54:35 GMT -4
Hey, that sounds good. Looks like you might be able to run it straight up even and have a nearly 0 deck height installation. That would yeild an even higher compression as long as nothing hits! By the way your EF10 pistons are in the mail.  |
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. Gave the head gasket surface a quick clean & ran the straight edge over it to check for warpage & it looks pretty good in that department. So now I need to get the head crack tested & checked for hardness, I did a quick hardness test myself & it seems okay, but I would like to get it confirmed.
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