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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum


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06-18-2021 02:51:51

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I just had my 1750 overhauled by the AGCO dealer, and it only has 300 lbs of psi in all cylinders. It is supposed to have 350 psi. The implement thinks the new pistons are the problem and the pistons come from reliants. Does anybody know where I can get other pistons or should I custom make them, or shave the top of the block down

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06-18-2021 11:11:04

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 Re: oliver1750 in reply to Bryan.Vrieze, 06-18-2021 02:51:51  
There have been many discussions on other forums about issues with Reliance piston and sleeve kits for the Oliver 310 diesel engines. Many of the issues reported are low compression pressure related resulting in hard starting. I was told by a well respected source in the Oliver world that he had dimensionally compared Reliance pistons to OEM and found the compression height of the Reliance pistons to be too low, resulting in low compression. This source said that for 310 engines he only uses piston and sleeve kits from Arrow Industries, years ago Arrow industries bought the rights to these engines from Waukesha.

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06-18-2021 15:57:00

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 Re: oliver1750 in reply to RCP, 06-18-2021 11:11:04  
Yes I have also heard bad things about reliance pistons. They are not made to the correct spec. As the originals. I would agree only use the agco/arrow pistons. I know a guy who rebuilt a 1650 this past winter. It is rebuilt to correct updates including valve protrusion, he used the reliance pistons and it still does not start very good. Maibach tractor told him to reuse the original pistons if they are in good shape.

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Gary Spitznogle

06-18-2021 09:30:42

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 Re: oliver1750 in reply to Bryan.Vrieze, 06-18-2021 02:51:51  
If you have access to old pistons measure depth of recess for valves and compare to new piston. I went through this a few years ago and several $$$$later figured it out. There was like .030 difference

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J. Schwiebert

06-18-2021 03:55:55

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 Re: oliver1750 in reply to Bryan.Vrieze, 06-18-2021 02:51:51  
What did they do to the head? Did they set the valve protrusion? If not you can gain 50 psi there/

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06-18-2021 04:07:00

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 Re: oliver1750 in reply to J. Schwiebert, 06-18-2021 03:55:55  
they went though the head with all new valves and its not oversided pistons

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06-18-2021 04:48:11

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 Re: oliver1750 in reply to Bryan.Vrieze, 06-18-2021 04:07:00  
As John said, I'll bet the head doesn't have the valves OUT of the head as they should be. Most Waukesha diesels need ALL new valve seats to get the head back in shape, just doing a valve grind drops the valves too much and KILLS compression heat needed for good cold starting. My White 4-78 forklift diesel was the same way, new seats were installed to get it right again..

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06-19-2021 13:51:38

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 Re: oliver1750 in reply to Dieseltech, 06-18-2021 04:48:11  
In the spring of 2018 I rebuilt my 310 T as did a good freind of mine. I used Reliance in mine and he used Arrow in his. I had my old pistons compared to both the Arrow and the Reliance by the guy I had do all my block work, and they are a highly respected builder of race engines and high performance diesels.
Upon there review and comparrison they claim there was little to no differance between them, I was assured, so rather than return them I used the Reliance. When weighing them for balance, no corections were required between the six. My head had all new guides, seats and vavles, including springs and keepers. Protrusion on mine is the max allowed. The other was new valves only, ground seats. Heads were by two differant firms. Both pumps were taken to same rebuilder, and set at 10% over. The one i have starts way better and produces a little more power, noticable power.
I have no issues with Reliance, I personnally think they get a bad rap due to those who cut corners elsewhere, trying to save a buck, after all, thats why bought the Reliance in the first place.

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06-22-2021 07:07:28

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 Re: oliver1750 in reply to Cash4Toys, 06-19-2021 13:51:38  
So this is what I found about reliance. Up untill a few years ago they had very good quality control and had one main supplier for there pistons. Then they bought out a few smaller suppliers of engine kits and the quality went away. I spoke with a guy who was rebuilding a perkins out of an 1850 and ordered a reliance rebuild kit. Out of 6 pistons only 2 matched and the other 4 were completely different from each other. Cutting corners or not makes a big difference, but when the quality of parts is not there it makes it tough.

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06-20-2021 06:14:23

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 Re: oliver1750 in reply to Cash4Toys, 06-19-2021 13:51:38  
I'll second that!

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06-19-2021 14:27:51

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 Re: oliver1750 in reply to Cash4Toys, 06-19-2021 13:51:38  
When I had my forklift head off, all the valves were flush or a bit below the head surface. The pistons have a .140 inch deep valve relief, and with a .050 inch head gasket I felt comfortable having all the valves out .095-.100 inch out with the new seats. Engine starts MUCH better now..

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06-19-2021 20:43:34

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 Re: oliver1750 in reply to Dieseltech, 06-19-2021 14:27:51  
were did you get head work done i have a head from a 1650 two shops said they could not get it in spec. bought a head from tim smith to get it going. would like to fix this one.

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J. Schwiebert

06-20-2021 08:44:26

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 Re: oliver1750 in reply to ohiodick, 06-19-2021 20:43:34  
They are blowing smoke! I used to do them no problem. All the valves will need seats installed. Where are you located?

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06-20-2021 20:32:37

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 Re: oliver1750 in reply to J. Schwiebert, 06-20-2021 08:44:26  
25 miles south of canton oh.

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06-20-2021 05:16:15

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 Re: oliver1750 in reply to ohiodick, 06-19-2021 20:43:34  
I get my head work/seats installed by a local fellow that specializes in aluminum head repairs, he has a Serdi for guides and valve seats installation. His main business is repairing racing/sprint car engines, but does some ag work too. E-mail me at mhf35diesel@yahoo.com if you want his number.

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