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O/T 307 Olds engine experts

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Davidj

10-22-2005 20:49:44

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Looks like I might need to change the timing gears and chain. Its in an 87 Caprice. I"ve opened a few 305"s but this is a different engine altogether. Just wondering if I"m in for any nasty suprises or rude awakenings with this motor or not. I just put new intake gaskets in it and changed the water pump a few years ago, those went well, Or at least with only the usual quota of bad language. Car left me on the side of the road. Got fuel and spark so I pulled the cap and it looks to be about 22 degrees off. Any and all help appreciated. Thanks

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rotten robert

10-23-2005 17:17:28

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Re: O/T 307 Olds engine experts in reply to Davidj, 10-22-2005 20:49:44

If you"re talking about a 87" Chevrolet Caprice then it should have the 305 chevy small block engine. Pretty easy job except for wedging the timing cover back on. Cut some of the metal lip away and trim the ends of the pan seal a little and use a bunck of ucky pucky. Ultra Black silicone or Ultra red works best for me. Be cafeful to get the timing right as you can be 180 deg. out real easy.

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Jake B.

10-23-2005 11:38:56

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Re: O/T 307 Olds engine experts in reply to Davidj, 10-22-2005 20:49:44

Are you sure that it is an OLDS 307? It is my understanding that in 1987 Olds and Buick used the OLDS 307 and CHEV and PONTIAC used the pontiac 307.

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Davidj

10-23-2005 14:32:25

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Re: O/T 307 Olds engine experts in reply to Jake B., 10-23-2005 11:38:56

Not sure, distributer is at the back. How do you tell one from the other?

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bradk

10-23-2005 19:09:06

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Re: O/T 307 Olds engine experts in reply to Davidj, 10-23-2005 14:32:25

The Chev. distributor hold-down tab is on the pass.side. The Olds is on driver's side.I'm sure you have the Chev. engine.How many miles on this engine?~brad

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Chris Vangel

10-23-2005 20:11:09

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Re: O/T 307 Olds engine experts in reply to bradk, 10-23-2005 19:09:06

The easiest way to determine if the engine is the oldsmobile engine is if it has an oil fill tube in the front at the timing cover area. The chevrolet engine will fill oil through the valve cover. Also, the eighth digit in the vin code will be a "Y" for the olds engine. If you managed the Intake Manifold you should be able to do a chain. Good Luck.

Chris.

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Davidj

10-23-2005 21:27:08

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Re: O/T 307 Olds engine experts in reply to Chris Vangel, 10-23-2005 20:11:09

Yup. The filler is in front, the dist. hold-down is on the driver"s side and the 8th digit is a Y. Had a 77 Bel-air, an 83 caprice, an 81 parisienne and an 81 chev truck all with 305"s and all with soft cams in them. The cams all went bad just like clockwork at 130,000 km (80,000 miles). Changed the cams myself, not a hard job,just a big one. Sometimes though with a different engine you can run into a few surprises so I thought I"d check first. Thanks for the info. Parts are in Tuesday so I"ll let you know how it goes. Oh by the way Brad it has 243,000kms or about 150,000 miles on it. Leaks more oil than it burns.

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bradk

10-24-2005 05:39:53

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Re: O/T 307 Olds engine experts in reply to Davidj, 10-23-2005 21:27:08

With that many miles,I think you're on the right path.A little tougher than a s.b.chev.(because of the brackets) but definitely do-able.~brad

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Jimmy King

10-24-2005 04:10:29

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Re: O/T 307 Olds engine experts in reply to Davidj, 10-23-2005 21:27:08

I had a79 Impala that had 97000 on it when I bought it 180000 when I traded it, the lady that bought it drove it another 100000.

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Bob

10-23-2005 00:02:35

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Re: O/T 307 Olds engine experts in reply to Davidj, 10-22-2005 20:49:44

The timing chain is cleverly hidden behind a steel plate, behind the water pump.

Is your's fuel injected? If not (if it's carbureted), there is a cam assembly on the upper timing gear that operates the fuel pump, that needs to be assembled properly.

Otherwise, it's a pretty straightforward job.

Be sure to clean the plate behind the waterpump thoroughly of the old gasket, and follow the instructions packed with the fornt cover gaskets as to what sealer (if any) to use with the gaskets.

Oh yeah, and get GOOD gaskets such as Fel-Pro.

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farmboysteve

10-24-2005 15:18:06

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Re: O/T 307 Olds engine experts in reply to Bob, 10-23-2005 00:02:35

on the olds they use an aluminum rocker holddown that tends to let the valve adjustment get way too loose and rattle. the 2 in the middle of each head at the exaust cross over take the most wear because of the heat. while you have if torn down that far, not much trouble to take valve cover off and check.

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Kmiller

10-24-2005 18:42:50

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Re: O/T 307 Olds engine experts in reply to farmboysteve, 10-24-2005 15:18:06

I just did a 350 Olds for my daughter's Firebird, he's right, the aluminum rocker hold-downs are sorta fragile so you have to tighten them down evenly to keep from breaking them. There are steel aftermarket ones you can get, they're only about 3 bucks each and are much better than the originals.

The timing gears are no problem, just a little different than a S.B. Chevy. Be sure the plate and gasket surface are very clean and make sure the plate is very flat. Mine had a little rust so it took a little extra care to seal it.

If you can do a Chevy, you can do an Olds. It's a little different, but not hard.

Kerry

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Davidj

10-24-2005 19:49:31

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Re: O/T 307 Olds engine experts in reply to Kmiller, 10-24-2005 18:42:50

Do you mean the nuts you do the valve adjusting with? Not sure what you mean by the hold-downs but I"ll pull the covers and check. Probably will be obvious when I do. Not much valve noise though but doesn"t hurt to be sure. Thanks for the heads up. David

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