71 model d lower end rebuild?

sharky55 · 10-31-2017, 09:31 AM

Hello everyone!! Piston was chipped and looks like some needle bearings were crushed between piston and the head. Not sure where they came from yet, or it is the rings that broke and got smashed between head and piston. Either way I need direction on weather I do a bottom rebuild while I have motor out. My biggest worry is all the parts available if something is broken while I’m tearing apart. I am leaking oil on the backside of the lower unit. Which would be the seal. Is this something I can do myself or should I take it to a local motor shop to have the head board out. Or should I get a whole new head and piston together? My existing head is in decent shape but I guess I have to take measurements to figure out how much I’m working with . Please let me know what you guys would do thanks!!

Also if I do the lower end unit, I will have to take apart the transmission. So I’m worried about damaging that when I take apart at this point it is not leaking any fluid.

sharky55 · 10-31-2017, 01:31 PM

Ok I got fan off and there is a 6204 rs Bearing’s in there.It’s just a sealed bearing. I can’t figure out how to post images but it’s in my file if you can take a look

aircooled85 · 10-31-2017, 04:21 PM

You have a bearing on the clutch side of the engine and 2 sealed ball bearings on fan side. Also the piston has a bearing in the rod where the piston pin is. Is there slop in the piston movement? Either way you need to replace the bearings.

sharky55 · 11-01-2017, 07:02 AM

Ok thanks aircooled, looks like the last person just put in sealed bearings and didn’t bother with the oil seal. Which would make sense. So I got a price of 150 to rebore the top end. Not sure if that includes a piston rings. I’ll keep you updated thanks again. I’ll be taking Clutch off today

sharky55 · 11-03-2017, 03:37 PM

torrington jh-1616 Is the bearing part number 10 for the transmission drive side of the lower unit

sharky55 · 11-08-2017, 02:05 PM

Drive side of case looks worn,, is this ok?

t

Lochlin · 11-09-2017, 10:52 AM

So long as there isn't much play in your crankshaft when seated and the case seals up good and tight you'll be ok.

tew45 · 11-11-2017, 01:50 AM

A new top end runs about $150.00 on ebay with cylinder, piston, and rings.

10-31-2017, 09:31 AM	#1
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	71 model d lower end rebuild? Hello everyone!! Piston was chipped and looks like some needle bearings were crushed between piston and the head. Not sure where they came from yet, or it is the rings that broke and got smashed between head and piston. Either way I need direction on weather I do a bottom rebuild while I have motor out. My biggest worry is all the parts available if something is broken while I’m tearing apart. I am leaking oil on the backside of the lower unit. Which would be the seal. Is this something I can do myself or should I take it to a local motor shop to have the head board out. Or should I get a whole new head and piston together? My existing head is in decent shape but I guess I have to take measurements to figure out how much I’m working with . Please let me know what you guys would do thanks!! Also if I do the lower end unit, I will have to take apart the transmission. So I’m worried about damaging that when I take apart at this point it is not leaking any fluid.

10-31-2017, 01:31 PM	#2
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	Re: 71 model d lower end rebuild? Ok I got fan off and there is a 6204 rs Bearing’s in there.It’s just a sealed bearing. I can’t figure out how to post images but it’s in my file if you can take a look

10-31-2017, 04:21 PM	#3
aircooled85 Getting Wild Join Date: Jun 2017 Location: Upstate South Carolina Posts: 140	Re: 71 model d lower end rebuild? You have a bearing on the clutch side of the engine and 2 sealed ball bearings on fan side. Also the piston has a bearing in the rod where the piston pin is. Is there slop in the piston movement? Either way you need to replace the bearings.

11-01-2017, 07:02 AM	#4
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	Re: 71 model d lower end rebuild? Ok thanks aircooled, looks like the last person just put in sealed bearings and didn’t bother with the oil seal. Which would make sense. So I got a price of 150 to rebore the top end. Not sure if that includes a piston rings. I’ll keep you updated thanks again. I’ll be taking Clutch off today

11-03-2017, 03:37 PM	#5
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	Re: 71 model d lower end rebuild? torrington jh-1616 Is the bearing part number 10 for the transmission drive side of the lower unit

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11-08-2017, 02:05 PM	#6
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	Re: 71 model d lower end rebuild? Drive side of case looks worn,, is this ok?t Last edited by sharky55; 11-08-2017 at 02:12 PM.. Reason: Pic

11-09-2017, 10:52 AM	#7
Lochlin Gone Wild Join Date: May 2011 Location: Pittsburgh Posts: 2,950	Re: 71 model d lower end rebuild? So long as there isn't much play in your crankshaft when seated and the case seals up good and tight you'll be ok.

11-11-2017, 01:50 AM	#8
tew45 Gone Wild Join Date: Aug 2007 Location: North Texas Posts: 2,312	Re: 71 model d lower end rebuild? A new top end runs about $150.00 on ebay with cylinder, piston, and rings.

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