Pontiac V8 engine
(Add text, link, images; minor clean up) |
(Add text, links, image) |
||
| Line 270: | Line 270: | ||
<br style="clear:both"/> | <br style="clear:both"/> | ||
See [[Hot rodding the HEI distributor]]. | See [[Hot rodding the HEI distributor]]. | ||
| + | |||
| + | ==Timing covers== | ||
| + | The following is from [http://forums.highperformancepontiac.com/70/6720258/the-general-discussion/water-pumps/#ixzz23bpSfjpr High Performance Pontac forums]: | ||
| + | <blockquote>All of the timing chain covers from 1964 to 1979 will bolt up and interchange with any motor from those years. However, you must use the matching water pump, pulley and crank pulley to avoid alignment problems with the alternator and/or power steering pump. All of the water pumps from ‘64-‘68 will interchange. These pumps have eight bolts and measure 3-5/8” long (from base to water pump pulley flange). The casting number for ‘64-‘65 is 9772716 and for ‘66-‘68 it is 4782482. The matching pulleys are 2” in height. From ‘64-‘67 Pontiac used a small diameter (5.25”) six bolt two-piece harmonic damper and from 68-79 a large diameter (6.75”), one piece four bolt damper was used. In ’69 Pontiac changed to an 11-bolt water pump but the early ’69 was different from late ’69-on. Many early ’69 Firebirds and GTO's used a pump that measured 4” long (casting# 9796351) and the pulley was 2-1/4” in height. From late ’69 to ’79 only one pump style was used, it measured 4-1/2” long and there are at least two different casting numbers used: 482138 and 488296. The matching pulley should measure 2-5/8” in height. Always use the correct diameter and style crank pulley to match the water pump pulley and also use the same series timing chain cover and balancer to properly line up your timing marks. The same timing chain cover was used for both ‘64 & ‘65 and had just a simple pointer. These were cast with number 9773371. The timing cover used on ’66 and ’67 employed a small timing scale marked -4, 0, and +6 and is otherwise identified as casting # 9783130. The ’68, ’69 and ’70 timing covers look very similar with timing marks of 0-6-12 degrees BTDC and accommodated the large diameter damper. The ’68 timing cover casting number is 9790347 and uses the 8-bolt water pump. The ’69-‘70 timing cover casting number is 9796346 and uses the improved 11-bolt pump. For ’71 and later the timing cover timing tab is marked from 4 degrees after to 12 degrees BTDC and is graduated all the way to 16 degrees BTDC. As compression ratios were lowered to 8:1 and lower there became a need for increased initial advance. Casting number for this cover is 482883. If you need to order a water pump the Federal Mogul part numbers are: ‘64-’68 is FP1388N, early ’69 is FP1409N and late ’69-on is FP1423. | ||
| + | </blockquote> | ||
| + | |||
| + | ==Cooling system== | ||
| + | ===Water pump=== | ||
| + | There were two basic water pump designs used between 1964 and the end of production: an 8-bolt (up to '68-early '69) and an 11-bolt pump used after the 8-bolt pump. | ||
| + | |||
| + | If the engine seems to be overheating, first be sure the temp gauge is reading correctly. Use a temporary mechanical gauge to check it. Then check the ignition timing to be sure it's not retarded. | ||
| + | |||
| + | Be sure the thermostat is working as it should. If you have a clutch fan, check it for correct operation as well. Be sure there's no belt slippage- sometimes you won't hear the belt squeal. If you have a flex fan, they can cool poorly. You also need a shroud that fits the fan assembly. | ||
| + | |||
| + | [url=http://www.wallaceracing.com/water-pump-mods.php Here] is some info on the divider plate that shows how to set the clearance up. No rust holes allowed! | ||
| + | |||
| + | Also be sure the sleeves/grommets are in place correctly. | ||
| + | |||
| + | [[File:Pont tubes.jpg|thumb|left|400px|Red arrow indicates rubber grommet inserted into sleeves used on 11-bolt pump assembly]] <br style="clear:both"/> | ||
==Parts interchangeability== | ==Parts interchangeability== | ||
Your Privacy Choices