# Compression leak in cylinder 3w

**URL:** <https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751>\
**Category:** Maintenance/Repairs\
**Tags:** toyota, pickup\
**Created:** [April 7, 2017, 8:02pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751 "2017-04-07T20:02:35Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![Sdooley6321](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@Sdooley6321](https://community.cartalk.com/u/Sdooley6321)\
**Post date:** [April 7, 2017, 8:02pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/1 "2017-04-07T20:02:36Z")

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There is 94k original miles on my vehicle. There is a compression leak in cylinder 3 after having the valve cover gasket, timing belt, and hydrollic clutch replaced. What could be the cause of it.? My truck was fine before the repairs.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [April 7, 2017, 8:06pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/2 "2017-04-07T20:06:52Z")

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The only thing you list that can effect compression in a cylinder is the timing belt being installed incorrectly.

Tester

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<div class="post-metadata">

**Author:** ![Sdooley6321](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@Sdooley6321](https://community.cartalk.com/u/Sdooley6321)\
**Post date:** [April 7, 2017, 8:08pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/3 "2017-04-07T20:08:54Z")

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How do I know if it was installed improperly? Im a female and the shop that I took it to now wants to charge me $2500 to fix the problem. I believe it is their mistake. The truck was fine before. No compression leaks and it has only 94k original miles

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [April 7, 2017, 8:13pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/4 "2017-04-07T20:13:31Z")

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You have to remove the timing covers, and see if the timing marks line up on the camshaft and crankshaft sprockets.

I would suggest you have this done at a different shop, so you get an unbiased opinion.

Tester

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<div class="post-metadata">

**Author:** ![Sdooley6321](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@Sdooley6321](https://community.cartalk.com/u/Sdooley6321)\
**Post date:** [April 7, 2017, 8:17pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/5 "2017-04-07T20:17:32Z")

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Thank you. Is it ok to drive?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [April 7, 2017, 8:19pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/6 "2017-04-07T20:19:57Z")

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No.

Loss of compression in a cylinder will cause a major misfire. And this can destroy the catalytic converter(s).

Tester

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<div class="post-metadata">

**Author:** ![Sdooley6321](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@Sdooley6321](https://community.cartalk.com/u/Sdooley6321)\
**Post date:** [April 7, 2017, 8:20pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/7 "2017-04-07T20:20:54Z")

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Thank you I wont drive it then. Thanks for your help.

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**Author:** ![kurtwm1](https://avatars.discourse-cdn.com/v4/letter/k/13edae/32.png) [@kurtwm1](https://community.cartalk.com/u/kurtwm1)\
**Post date:** [April 8, 2017, 1:32pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/8 "2017-04-08T13:32:51Z")

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Did they tell you what needs fixing and how do you know one cylinder is low on compression?

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**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\
**Post date:** [April 8, 2017, 2:24pm UTC](https://community.cartalk.com/t/compression-leak-in-cylinder-3w/102751/9 "2017-04-08T14:24:00Z")

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So! There was no problem when the truck was left for the repairs but when leaving that shop the problem was evident. Is that correct?