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Minneapolis Moline Tractors Discussion Forum
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Replacing Z head and block

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herald

07-18-2007 14:53:13




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I have a Z that I pulled one block on to replace the soft plugs. I have a question on when and how to replace the head and manifold. Do I loosen the remaining block, then put the head and manifold on, and then tighten both blocks? or what? Any help I would be thankful for. Harold




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BMG1

07-19-2007 05:28:22




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 Re: Replacing Z head and block in reply to herald, 07-18-2007 14:53:13  
Herald,
If the core plugs were bad in one block they're probably bad in the other. Replace them now why you have access to them.

Brian



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herald

07-19-2007 08:32:51




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 Re: Replacing Z head and block in reply to BMG1, 07-19-2007 05:28:22  
I did replace all the plugs. The old book I was reading, said to pull the back block and then you can get to all the plugs, which I did. But when I set the block back down it just didn't look right, thus the question. Any one know the torque on the block bolts? Thanks for all the answers. Was going to take it on a 175 mile tractor ride, but I'd better take the UB Special Sunday.



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Phil S

07-18-2007 21:27:21




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 Re: Replacing Z head and block in reply to herald, 07-18-2007 14:53:13  
Be sure to follow the torque pattern recomendations when torquing the head down.

Basically, start in the middle and work outwards in a circle. Clockwise.

Do this is stages as well. Do NOT goto max torque on each nut right off the bat. I usually go in a stage of 3.

It is recommended that you do replace the base block gasket on the other block. It should also be loose as well. The head pulls both blocks into alignment as it is torqued into position. Therefore, you want to make sure the other block is loose and not stuck in position.

I have rebuilt several of these motors on my own tractors and for others. The biggest thing I can tell you is to take your time.

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FLYROD

07-18-2007 21:51:37




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 Re: Replacing Z head and block in reply to Phil S, 07-18-2007 21:27:21  
Phil. I could not agree wit you more. You took up the slack where I left off. Thanks for doing that . just got off work and am kinda mentally worn down. Thanks again for taking up the slack.



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flyrod

07-18-2007 21:12:36




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 Re: Replacing Z head and block in reply to herald, 07-18-2007 14:53:13  
ummmm.IM KINDA CONFUSED HERE. You are wanting to take 1 cylinder block off and replace the soft plugs. Correct? My advice would be since you are going that far into the engine and etc. Pull off both blocks and replace the crankcase gasket because odds are you will damage it anyways due to it sticking and the same for the head gasket. due to the 206 engines 1 piece cylinder head. But ask my ole buddy Alan K on here. HE IS THE MAN. TRUST WHAT HE TELLS YOU. Best Regards and Good Luck with the ole girl.

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T.R.K.

07-18-2007 18:44:04




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 Re: Replacing Z head and block in reply to herald, 07-18-2007 14:53:13  
It is probably reccommended to start with the other block loose. But if you do that, you need to pull it and replace the crankcase gasket. (It would be a good idea anyway since you are in the engine that far already.) If you don't want to take a chance on losing the existing seal of the other block gasket, just drop the loose one on, put the head on with head gaskets and torque the head bolts to 50-55 ft. lb.. This will align the blocks. then tighten the block bolts. It would be a good idea to make sure none are loose on the other block too.

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