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post #16 of 18 Old 06-04-2019, 08:41 AM
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Re: 646 questions

The OEM ignition coil was located in that hole, so the bottom end was in the air flow.. Supposed to cool the coil, but it also blocks air flow to the piston on that side. Make sure that the hole is blocked off. Its important to make sure all of the engine tins are on there so the pistons and heads get cooled.

The coil opening can be blocked with a PVC test cap, which is what I have in my engine.. Also make sure there is a rubber or foam seal around the engine oil filter to close up that opening so air does not escape their either.

1973 Case 646 (w/Custom Power Steering)
1968 Case 155
1958 JI Case 310 Terratrac Crawler Loader
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post #17 of 18 Old 06-04-2019, 08:53 AM
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Join Date: Mar 2013
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Re: 646 questions

Older designed engines did not yet have the engine specs of today's engines. Most modern cars never need oil before it is changed. That was not the case in the '70s. In the 70's you needed to check your oil every couple gas fillups.

That puff of blue is normal. You are more going to follow how much oil it uses than anything else.
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post #18 of 18 Old 06-04-2019, 09:47 AM Thread Starter
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Re: 646 questions

Quote:
Originally Posted by sddunt View Post
The OEM ignition coil was located in that hole, so the bottom end was in the air flow.. Supposed to cool the coil, but it also blocks air flow to the piston on that side. Make sure that the hole is blocked off. Its important to make sure all of the engine tins are on there so the pistons and heads get cooled.

The coil opening can be blocked with a PVC test cap, which is what I have in my engine.. Also make sure there is a rubber or foam seal around the engine oil filter to close up that opening so air does not escape their either.
thanks for clearing that up. I was pretty sure it should not be open. I'll start saving up $ for that cap. LP
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