Just water pump ...or more work

PostPost by: djb222 » Mon May 21, 2018 7:57 pm

I purchased a water pump kit last week as although no leaks were apparent there was movement in the bearings. So started to remove parts eventually got to the cylinder head. On removal I was surprised to see such a build up of carbon on the pistons but more so on the valves. The block bores are smooth with no ridge at the tops but no evidence of honing marks.... Does the block need re honing? Any advice...take a look at the video.

https://youtu.be/noQ-YWJgtkI
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PostPost by: rgh0 » Mon May 21, 2018 8:43 pm

The deposits are not abnormal but do look a little oily in a couple of places. Did you do a compression test before stripping the engine if so what were the results? What sort of oil consumption were you experiencing.? How many miles has the engine done since its last bottom end and top end rebuild?.

Answering the above questions would help determine if continuing to strip the pistons out of the block and valves out of the head to check for wear is worth the effort.

No honing marks present does not really signify a problem and with no step in the bore you don't have any significant bore wear apparent but you really need to pull out the pistons to check the bores and pistons and rings properly and pull the valves out to check the valves and seats and guides to be certain.

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PostPost by: djb222 » Mon May 21, 2018 9:17 pm

Thanks Rohan,

I don't know the history of the engine or if it's been rebuilt although it has covered around 110k miles, most of those in the first 10 years. I've only done about 100 miles since I purchased the car so not sure of any oil consumption that is apparent.

The compression was about 150psi with a variation of up to 10 psi.

I'll certainly remove the valves etc to give it a check over and a refurb.
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PostPost by: 2cams70 » Mon May 21, 2018 11:16 pm

What do the back of the valves look like? Is there a lot of heavy carbon deposits? Try wiggling the valves from side to side when on full lift too. Significant wiggle and carbon usually means worn guides.
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PostPost by: rgh0 » Tue May 22, 2018 11:21 am

djb222 wrote:Thanks Rohan,

I don't know the history of the engine or if it's been rebuilt although it has covered around 110k miles, most of those in the first 10 years. I've only done about 100 miles since I purchased the car so not sure of any oil consumption that is apparent.

The compression was about 150psi with a variation of up to 10 psi.

I'll certainly remove the valves etc to give it a check over and a refurb.



Check the bores diameter to see if its been rebored, that will tell you if the engine has had a significant bottom end rebuild which it almost certainly will have with 110k miles on the original engine block. With no lip in the bore the bottom rebuild is probably fairly recent in the last 30k miles most likely and may be OK.

For the head you need to check valve seat position and seat face condition as well as stem and guide wear. While checking for valve sideways movement at full lift gives an indication of guide wear you need a good micrometer and bore gauge to check the valve stems and guides top middle and bottom for clearance versus the specification. The inlets I like near the tight end of clearance range and the exhausts in the middle when building a new engine. The inlets getting to the top end of the clearance range will result in a smoky exhaust.

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