Re: Oil in injector housing?
 

Yep....this thread is a bit old but the technology stays the same :D


Adapting 91 IH to 90 Heads.

Three Dorman 550-013 plugs (two plugs drilled 7/32) were used to restrict IH PVC ports of the 91 IH (90 Heads do not have the required restriction).
http://i287.photobucket.com/albums/l...psc6d06f62.jpg

Re: Oil in injector housing?
 

Thanks Cliff, I've got some 550-013 and 550-012 on the way. This would have brought my weekend project to a grinding halt. I ASSUME I cannot pop the old ones out of the original IH?

Re: Oil in injector housing?
 

I never gave that a thought....hummmm? I am thinking they do come out? I can't remember, but we did have a thread that discussed exactly how much trouble it was on the assembly line to do the 90 oil vapor holes. I just don't remember all the particulars.

Sorry I'm so forgetful Steve!

:cheers:
Tom

Re: Oil in injector housing?
 

You could remove the baffles from the 1990 housings, but they would not fit into the 91 housings without machining. The drive plugs fit the cast hole as-is.

Re: Oil in injector housing?
 

Thanks guys.
Jerry, I still have to put an order together for you. I think I have a side line on injectors. -Steve

Re: Oil in injector housing?
 

Ended up using the Dormann 555-012 plugs. flattened them in a vise to make them slightly larger in diameter. Drilled 7/32" holes in two of them and drove them in place with a 3/8" extension. Looks good, lets hope it works good.

Re: Oil in injector housing?
 

Someone had asked about the plenum and IH I have for sale. They have a 90 and so the issue of oil port restriction came up. Searched the forum and came up w this thread. For grins, and since different people were using different sized Dorman plugs, I decided to measure the 2 sets of IHs I have.
One is a NOS w a manuf date of Sept.89, the other was on a motor and they were made 1 year later. Here's a picture comparing the two ports.

The dimensions are 1 5/32" 29.32mm
1 1/32" 26.25mm

The larger ports are the earlier NOS IH.

http://i187.photobucket.com/albums/x...psioyj4md7.jpg

Re: Oil in injector housing?
 

The top picture is of the same injector housing used for 90~92. The machine work to increase the port diameter to 1-5/32" is obvious and was done at Mercury in preparation for the baffle to be installed. The baffle was just never installed and it would work just fine on 91~92 models, just as it is, without the baffle installed. Some like this were probably installed on early 91 engines.

The bottom picture is of an "un-machined" port and would have been installed on 91~92, (can't see the injector bores so I am assuming it's the 90~92 style).

Re: Oil in injector housing?
 

Jerry,


Correct, they are both 90-92 style injector housings.