A Toyota ?. Am I in the right place?

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Butter - 26 Oct 2008 01:44 GMT

Got an 80 pickup with 20R motor. After head gasket blew and had to
have head surfaced i'm in process of putting it back together.
Problem is book says that when #1 piston is at TDC the cam dowel pin
should be at 12 oclock position. But that isn't where it is, its off
by maybe one link in the chain. I marked everything and also took
pictures during dissassembly (two months ago) and its now like it
was. ? is if the last time the head was surfaced (years ago by someone
else) could they have put cam in just a big off and it still ran? It
seemed to run ok especially considering its age.
Whata y'all think. Of course since this isn't about Obama or McCain i
doubt if anyone will read this.
Rosco

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Jeff Strickland - 26 Oct 2008 02:02 GMT

> Got an 80 pickup with 20R motor. After head gasket blew and had to
> have head surfaced i'm in process of putting it back together.
[quoted text clipped - 8 lines]
> doubt if anyone will read this.
> Rosco

Then the cam is not in the right place, or the crank is not in the right
place.

There should be a mark on the crank and cam that align perfectly with the
centerline of these two shafts. If you align the marks to the centerline of
the shafts, then the timing will be right. If the alignment marks and the
centerline do not line up, then you have done something wrong.

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Cathy F. - 26 Oct 2008 02:04 GMT

There's a lot of extraneous 'noise' here, but I'm betting someone - or two -
will answer. The car/vehicle questions do get replies.

OTOH, I know virtually nothing about the workings of car engines, so can't
offer you any advice other than this sounds like a "Tom & Ray" sort of
question. ;-P Oh, but wait a minute, Ray (Ray O., resident guru) may well
answer you. ;-)

Cathy

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Jeff Strickland - 26 Oct 2008 02:09 GMT

>> Got an 80 pickup with 20R motor. After head gasket blew and had to
>> have head surfaced i'm in process of putting it back together.
[quoted text clipped - 18 lines]
>
> Cathy

Stick to politics, Cathy ...

<waiting for the ruler across my knuckles>

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in2-dadark@webtv.net - 26 Oct 2008 04:19 GMT

There's a lot of extraneous 'noise' here, but I'm betting someone - or
two - will answer. The car/vehicle questions do get replies.
OTOH, I know virtually nothing about the workings of car engines, so
can't offer you any advice other than this sounds like a "Tom & Ray"
sort of question. ;-P Oh, but wait a minute, Ray (Ray O., resident guru)
may well answer you. ;-)
Cathy
======================

She knows 'virtually' nothing.....

That about sums it up and yet it doesn't dissuade her from running her
mouf..

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Ray O - 26 Oct 2008 07:43 GMT

It has been a long time since I looked at a 20R motor, but Toyota generally
uses a mark on the front of the camshaft or camshaft sprocket to indicate
proper cam timing, not the dowel pin location.

While you have the timing cover off, think about replacing the chain
tensioner as they were occasionally problematic.

Signature

Ray O
(correct punctuation to reply)

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Gary L. Burnore - 26 Oct 2008 15:24 GMT

> Got an 80 pickup with 20R motor. After head gasket blew and had to
>have head surfaced i'm in process of putting it back together.
>Problem is book says that when #1 piston is at TDC the cam dowel pin
>should be at 12 oclock position. But that isn't where it is, its off
>by maybe one link in the chain.

"by maybe"? You've got to be certain where it is. Get a
straight-edge like a level and use it. Not just you eye.

> I marked everything and also took
>pictures during dissassembly (two months ago) and its now like it
>was. ? is if the last time the head was surfaced (years ago by someone
>else) could they have put cam in just a big off and it still ran?

It could, but really badly. Backfiring and such.

>It seemed to run ok especially considering its age.

It's got to be set up correctly to work correctly.

>Whata y'all think. Of course since this isn't about Obama or McCain i
>doubt if anyone will read this.

Yeah, me too. Note I didn't say "right", just correct.

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gburnore at DataBasix dot Com
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